Talmadge, J.
— Olds-Olympic, Inc. (Olds-Olympic) seeks indemnification from its primary and excess comprehensive general liability (CGL) insurers, Commercial Union Insurance Co. (Commercial Union) and Fireman’s Fund Insurance Co. (Fireman’s Fund) for costs incurred in removing contaminated soil that had allegedly polluted the groundwater under its Stone Way site near Lake Union in Seattle. The King County Superior Court entered a judgment on the verdict of the jury denying insurance coverage to Olds-Olympic. Although the jury made the necessary factual findings to support coverage under the CGL policies issued to Olds-Olympic when it found property damage to the State’s groundwater caused by an occurrence, the jury further determined Olds-Olympic had no legal liability for that property damage.
Because the jury was not properly instructed on the question of Olds-Olympic’s legal liability for the remedia[467]*467tion of the property damage at its Stone Way site, we reverse the judgment of the King County Superior Court and remand the case for a new trial confined to the question of Olds-Olympic’s legal liability for the costs of the remediation of the contamination to the groundwater, and damages, if any.
ISSUES
1. Did the trial court erroneously instruct the jury on the question of Olds-Olympic’s legal liability for the damage to the State’s groundwater under the CGL policies?
2. Did the trial court err in failing to dismiss the insurers’ late notice defense?
FACTS
Olds-Olympic operated a home heating oil distribution facility at 3410 Stone Way North in Seattle near Lake Union for 58 years. Three 20,000-gallon underground storage tanks for oil were installed at the site in the 1950’s. In 1970, two additional 250-gallon waste oil tanks were installed. Olds-Olympic also had an underground gasoline storage tank for fueling company vehicles on the site.
Two major fuel spills occurred on the site in 1972 and 1974. In 1972, a Shell Oil tank overturned at the Stone Way property, spilling approximately 4,200 gallons of diesel fuel into the soil. Only 500 gallons of the fuel were recovered. The subsequent spill involved several thousand gallons of heating oil which spilled onto the ground after pumps were activated because a previous user had not properly closed a fuel valve.
In 1985, Olds-Olympic sold the Stone Way site to Wayne Singleton, but continued to lease the property from him for its oil business. In 1986, Olds-Olympic ceased operating its home heating oil distribution facility, and discontinued using the underground storage tanks on the site, but used the site for other purposes.
[468]*468In December 1988, Olds-Olympic notified the Department of Ecology (DOE) of the potential pollution resulting from a leaking underground storage tank on the Stone Way site, but leaks from the tank were not a major oil contamination source.1
In June 1989, the Fremont Dock Company (Fremont Dock) purchased the Stone Way property from Singleton. Under the sales agreement, Fremont Dock agreed to remove the underground storage tanks, and contracted with a firm to remove the fuel handling facilities and underground storage tanks. Olds-Olympic learned of potential contamination of the soil at the Stone Way site from Fremont Dock when the first storage tank was removed.
Olds-Olympic hired environmental consultants to document the environmental conditions during removal of the remaining underground storage tanks and to recommend remedial action for the site. Ultimately, Olds-Olympic removed the underground storage tanks and the contaminated soil from the site in 1989-90. During this period, Washington State Department of Ecology (DOE) officials visited the Stone Way site and advised Olds-Olympic about the disposition of contaminated soils and notified OldsOlympic about the recommended levels of groundwater cleanup in light of a petroleum-related hazard.2 OldsOlympic’s environmental consultants advised it that, [469]*469under Washington law, original operators of the site during the contamination period would ultimately be held responsible for cleanup of the site. This duty was confirmed by DOE officials.3
Although DOE, the Singletons, or Fremont Dock, did not file a lawsuit against Olds-Olympic and DOE did not initiate any of its other formal enforcement actions under ROW 70.105D, Olds-Olympic was not operating in a legal vacuum. Both Mr. Singleton and John Mead of Fremont Dock testified they hired legal counsel and advised Forrest Bailey of Olds-Olympic they intended to hold Olds-Olympic responsible for the problems at the Stone Way site. Report of Proceedings at 835-36, 846-48. Olds-Olympic received a demand letter from Singleton and Fremont Dock, advising it would be held responsible for any cleanup of the Stone Way site. Report of Proceedings at 328-29. DOE sought voluntary compliance with cleanup standards (an "independent cleanup”) by Olds-Olympic before initiating any formal action. Report of Proceedings at 491, 577-78.4
[470]*470Olds-Olympic paid for the cost of removing the contaminated soil on the site. It contends the cleanup of groundwater was effectuated by passive remediation, the removal of the soil rather than the groundwater. Prior to removing the soil, but after the contacts with Singleton, Fremont Dock, and DOE, Olds-Olympic sought insurance coverage from its CGL carriers. Commercial Union, by letter of December 11, 1989, denied any duty to defend or cover Olds-Olympic. Ex. 28. Shortly thereafter, Fireman’s Fund sent a letter to Olds-Olympic denying a defense or coverage under the excess CGL policy. Ex. 154.
In 1992, Olds-Olympic filed the present action against its insurers seeking a declaration of coverage under the policies for remediation costs it incurred at the Stone Way site, and for damages and attorney fees under the Consumer Protection Act, RCW 19.86.5 The case was tried in the King County Superior Court against Commercial Union and Fireman’s Fund. The jury returned a verdict in favor of Commercial Union and Fireman’s Fund. In specific response to interrogatories, the jury found there was property damage to the groundwater of the State as a result of an occurrence at the Stone Way site, but OldsOlympic did not have a legal obligation with respect to the property damage to the groundwater. The trial court entered judgment upon the verdict, and subsequently denied Olds-Olympic’s motion for judgment notwithstanding the verdict or for a new trial. We accepted direct review in this case.
[471]*471ANALYSIS
1. THE INSURANCE CONTRACTS
Commercial Union insured Olds-Olympic by a CGL policy which contained the following insuring agreement for the period from 1974 to 1984:
The company will pay on behalf of the insured all sums which the insured shall become legally obligated to pay as damages because of. . . property damage to which this insurance applies, caused by an occurrence, and the company shall have the right and duty to defend any suit against the insured seeking damages on account of such . . .
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Talmadge, J.
— Olds-Olympic, Inc. (Olds-Olympic) seeks indemnification from its primary and excess comprehensive general liability (CGL) insurers, Commercial Union Insurance Co. (Commercial Union) and Fireman’s Fund Insurance Co. (Fireman’s Fund) for costs incurred in removing contaminated soil that had allegedly polluted the groundwater under its Stone Way site near Lake Union in Seattle. The King County Superior Court entered a judgment on the verdict of the jury denying insurance coverage to Olds-Olympic. Although the jury made the necessary factual findings to support coverage under the CGL policies issued to Olds-Olympic when it found property damage to the State’s groundwater caused by an occurrence, the jury further determined Olds-Olympic had no legal liability for that property damage.
Because the jury was not properly instructed on the question of Olds-Olympic’s legal liability for the remedia[467]*467tion of the property damage at its Stone Way site, we reverse the judgment of the King County Superior Court and remand the case for a new trial confined to the question of Olds-Olympic’s legal liability for the costs of the remediation of the contamination to the groundwater, and damages, if any.
ISSUES
1. Did the trial court erroneously instruct the jury on the question of Olds-Olympic’s legal liability for the damage to the State’s groundwater under the CGL policies?
2. Did the trial court err in failing to dismiss the insurers’ late notice defense?
FACTS
Olds-Olympic operated a home heating oil distribution facility at 3410 Stone Way North in Seattle near Lake Union for 58 years. Three 20,000-gallon underground storage tanks for oil were installed at the site in the 1950’s. In 1970, two additional 250-gallon waste oil tanks were installed. Olds-Olympic also had an underground gasoline storage tank for fueling company vehicles on the site.
Two major fuel spills occurred on the site in 1972 and 1974. In 1972, a Shell Oil tank overturned at the Stone Way property, spilling approximately 4,200 gallons of diesel fuel into the soil. Only 500 gallons of the fuel were recovered. The subsequent spill involved several thousand gallons of heating oil which spilled onto the ground after pumps were activated because a previous user had not properly closed a fuel valve.
In 1985, Olds-Olympic sold the Stone Way site to Wayne Singleton, but continued to lease the property from him for its oil business. In 1986, Olds-Olympic ceased operating its home heating oil distribution facility, and discontinued using the underground storage tanks on the site, but used the site for other purposes.
[468]*468In December 1988, Olds-Olympic notified the Department of Ecology (DOE) of the potential pollution resulting from a leaking underground storage tank on the Stone Way site, but leaks from the tank were not a major oil contamination source.1
In June 1989, the Fremont Dock Company (Fremont Dock) purchased the Stone Way property from Singleton. Under the sales agreement, Fremont Dock agreed to remove the underground storage tanks, and contracted with a firm to remove the fuel handling facilities and underground storage tanks. Olds-Olympic learned of potential contamination of the soil at the Stone Way site from Fremont Dock when the first storage tank was removed.
Olds-Olympic hired environmental consultants to document the environmental conditions during removal of the remaining underground storage tanks and to recommend remedial action for the site. Ultimately, Olds-Olympic removed the underground storage tanks and the contaminated soil from the site in 1989-90. During this period, Washington State Department of Ecology (DOE) officials visited the Stone Way site and advised Olds-Olympic about the disposition of contaminated soils and notified OldsOlympic about the recommended levels of groundwater cleanup in light of a petroleum-related hazard.2 OldsOlympic’s environmental consultants advised it that, [469]*469under Washington law, original operators of the site during the contamination period would ultimately be held responsible for cleanup of the site. This duty was confirmed by DOE officials.3
Although DOE, the Singletons, or Fremont Dock, did not file a lawsuit against Olds-Olympic and DOE did not initiate any of its other formal enforcement actions under ROW 70.105D, Olds-Olympic was not operating in a legal vacuum. Both Mr. Singleton and John Mead of Fremont Dock testified they hired legal counsel and advised Forrest Bailey of Olds-Olympic they intended to hold Olds-Olympic responsible for the problems at the Stone Way site. Report of Proceedings at 835-36, 846-48. Olds-Olympic received a demand letter from Singleton and Fremont Dock, advising it would be held responsible for any cleanup of the Stone Way site. Report of Proceedings at 328-29. DOE sought voluntary compliance with cleanup standards (an "independent cleanup”) by Olds-Olympic before initiating any formal action. Report of Proceedings at 491, 577-78.4
[470]*470Olds-Olympic paid for the cost of removing the contaminated soil on the site. It contends the cleanup of groundwater was effectuated by passive remediation, the removal of the soil rather than the groundwater. Prior to removing the soil, but after the contacts with Singleton, Fremont Dock, and DOE, Olds-Olympic sought insurance coverage from its CGL carriers. Commercial Union, by letter of December 11, 1989, denied any duty to defend or cover Olds-Olympic. Ex. 28. Shortly thereafter, Fireman’s Fund sent a letter to Olds-Olympic denying a defense or coverage under the excess CGL policy. Ex. 154.
In 1992, Olds-Olympic filed the present action against its insurers seeking a declaration of coverage under the policies for remediation costs it incurred at the Stone Way site, and for damages and attorney fees under the Consumer Protection Act, RCW 19.86.5 The case was tried in the King County Superior Court against Commercial Union and Fireman’s Fund. The jury returned a verdict in favor of Commercial Union and Fireman’s Fund. In specific response to interrogatories, the jury found there was property damage to the groundwater of the State as a result of an occurrence at the Stone Way site, but OldsOlympic did not have a legal obligation with respect to the property damage to the groundwater. The trial court entered judgment upon the verdict, and subsequently denied Olds-Olympic’s motion for judgment notwithstanding the verdict or for a new trial. We accepted direct review in this case.
[471]*471ANALYSIS
1. THE INSURANCE CONTRACTS
Commercial Union insured Olds-Olympic by a CGL policy which contained the following insuring agreement for the period from 1974 to 1984:
The company will pay on behalf of the insured all sums which the insured shall become legally obligated to pay as damages because of. . . property damage to which this insurance applies, caused by an occurrence, and the company shall have the right and duty to defend any suit against the insured seeking damages on account of such . . . property damage, even if any of the allegations of the suit are groundless, false or fraudulent and may make such investigation and settlement of any claim or suit as it deems expedient ....
Ex. 12. Commercial Union provided similar coverage to Olds-Olympic for the period from 1966 to 1974. Fireman’s Fund provided a similar CGL coverage to Olds-Olympic excess to the coverage of Commercial Union. The policies also covered Olds-Olympic for liability assumed by a contract.
Insofar as Commercial Union and Fireman’s Fund received premiums from Olds-Olympic for CGL coverage, their insurance obligation is interpreted in a fashion consistent with the undertaking described in the policy label. Insureds are not purchasing "almost comprehensive” coverage. CGL policies are marketed by insurers as comprehensive in their scope and should be strictly construed when the insurer attempts to subtract from the comprehensive scope of its undertaking.
In the present case, the Commercial Union CGL policy contained an "owned property” exclusion, which excluded coverage for first party events pertaining to the property of the insured. The exclusion stated:
[472]*472This insurance does not apply: ... to property damage to (1) property owned or occupied by or rented to the insured, (2) property used by the insured, or (3) property in the care, custody or control of the insured or as to which the insured is for any purpose exercising physical control; . . .
Ex. 12. The Fireman’s Fund policy contained similar exclusionary language relating to the owned property of the insured.
2. WASHINGTON’S MODEL TOXIC CONTROL ACT
The general basis for the legal liability of Olds-Olympic to the State of Washington or by contract to the Singletons and Fremont Dock for their liability to the State of Washington is the Model Toxic Control Act of 1989 (MTCA). Washington adopted the MTCA in 1989 pursuant to Initiative Measure No. 97. RCW 70.105D et seq. governs liability for damages caused by hazardous substance releases. While the Act is designed to deal both with the remediation of former environmental hazards and to prevent environmental hazards in the future, a past or present property owner is strictly liable for the remediation of environmental hazards caused by hazardous substances it released or were released on its property. RCW 70.105D.040(2).6 Petroleum products are among the hazardous substances regulated by MTCA. RCW 70.105D.020(6)(d).
[473]*473 For purposes of liability coverage, voluntary cleanup costs incurred by an insured under MTCA may be damages, even in the absence of a formal enforcement action by the State. In Boeing Co. v. Aetna Casualty and Sur. Co., 113 Wn.2d 869, 784 P.2d 507 (1990), we held costs the insured was required to pay to the State as reimbursement for cleanup under MTCA were "damages” the insured was legally obligated to pay within the meaning of a CGL policy. We noted "coverage does not hinge on the form of action taken or the nature of relief sought. . . .” Id. at 878 (quoting Fireman’s Fund Ins. Co. v. Ex-Cell-O Corp., 662 F. Supp. 71, 75 (E.D. Mich. 1987)). Even voluntary cleanup costs have been found to be damages within the meaning of a CGL policy, particularly where the voluntary cleanup of groundwater prevented much greater damage and the court wished to encourage quick remedial action. Upjohn Co. v. New Hampshire Ins. Co., 178 Mich. App. 706, 444 N.W.2d 813 (1989), rev’d on other grounds, 476 N.W.2d 392 (Mich. 1991). Similarly, in Weyerhaeuser Co. v. Aetna Casualty and Sur. Co., 123 Wn.2d 891, 874 P.2d 142 (1994), we held it would be a "reasonable reading” of a CGL policy to conclude there is coverage even prior to a suit or formal claim where a statute imposes liability and there has been property damage. Id. at 913 (reversing summary judgment for insurers).
3. THE INSURERS’ COVERAGE OF OLDS-OLYMPIC
The principal issue is whether the CGL policies afforded coverage to Olds-Olympic for Olds-Olympic’s liability to the State under MTCA for the cost of remediating groundwater pollution.7 The CGL policies generally [474]*474require coverage for the insured where the insured becomes legally obligated to pay damages because of property damage caused by an occurrence. The exclusionary language in the policies makes clear the property damage must be to the property interest of another rather than to the property owned by the insured itself.
In the present case, the trial court instructed the jury in instruction 148 that Commercial Union undertook to cover Olds-Olympic pursuant to the CGL policy. In instruction 19,9 the trial court defined "property damage” under [475]*475the policy, and in instruction 2010 defined "legal obligation or liability” within the meaning of the policy. The trial court instructed the jury in instruction 2111 on strict liability. The trial court instructed the jury with respect to the owned property exclusion in the Commercial Union CGL policy in instructions 2312 and 24,13 and attempted to inform the jury about the distinction between damages and "preventative measures” in instruction 22.14
[476]*476Under the trial court’s coverage instructions, the jury was asked if an "occurrence” took place during any year at the Stone Way site. The jury answered affirmatively. The jury found occurrences took place in 1972, 1973, 1974, 1975, and 1988. The jury was then asked: "Was there property damage to groundwater as a result of an occurrence at the Stone Way site?” The jury answered affirmatively. In the next interrogatory, the jury found property damage to groundwater from 1972 to 1990. All of the parties in this case concede the groundwater belonged to the State of Washington, a third party, under RCW 90.44.04015 and article XXI, section 1 of our constitution.16 Br. of Appellant Olds-Olympic at 17; Br. of Resp’t Commercial Union at 26; Br. of Resp’t Fireman’s Fund at 15. In light of the jury’s answer to the interrogatories, property damage to the property of a third party resulted from an occurrence. Such damage ordinarily would invoke the coverage under the CGL policies.
However, under the policies’ insuring agreements, coverage is provided for damages the insured "shall become legally obligated to pay. ...” The trial court submitted the following additional interrogatory to the jury: "Was there a legal obligation or liability because of property damage to groundwater for any year?” Clerk’s Papers at 828. The jury answered "no.” This interrogatory was ambiguous.
The insurers contend the jury determined there was no [477]*477legal obligation or liability for cleanup because the damage to the groundwater was below minimum mandated levels. The jury was not asked to determine, however, whether the damage to the groundwater was above or below minimum mandated levels. The jury was left to speculate as to what levels of groundwater contamination are sufficient to provoke a MTCA response. Instruction 20 is not specific enough to guide the jury. It speaks only to "compliance with a statute which imposes strict liability for cleanup of groundwater.” Clerk’s Papers at 809. The jury was not instructed as to what "compliance” is in this case. While the jury may well have concluded the damage to the groundwater was not severe enough to give rise to liability to remediate the groundwater, and therefore, no legal obligation or liability arose on the part of OldsOlympic to the State, that question was not specifically posed to the jury.
An equally compelling argument could be made the real purpose of the interrogatory was to determine whether or not Olds-Olympic acted under any legal compulsion or was simply acting voluntarily to prevent a future problem. If the intent of the ambiguous interrogatory was for the jury to decide whether there is no legal obligation or liability because Olds-Olympic’s actions were voluntary and designed to prevent future harm that had not yet occurred, instruction 22 was insufficient to assist the jury on the law. Instruction 22 advised: "Preventive measures taken before property damage has occurred are not costs incurred because of property damage.” Clerk’s Papers at 811 (emphasis added). Plainly, any remedial steps by OldsOlympic post-dated the property damage to the groundwater. Thus, the jury was not advised of the legal difference between the remediation Olds-Olympic was obliged to undertake and preventive measures not covered by a CGL policy. In Boeing Co. v. Aetna, we illustrated costs that are not incurred "because of’ property damage by citing the following example:
Petitioners have two underground storage tanks for toxic [478]*478wastes. Tank # 1 has leaked wastes into the soil which have migrated to the groundwater or otherwise polluted the environment. Tank #2 has not leaked, but government inspectors discover that it does not comply with regulatory requirements, and could eventually leak unless corrective measures are taken. Response costs associated with Tank # 1 will be covered as damages, because pollution has occurred. Tank #2 would not be covered. Likewise, the expense of capital improvements to prevent pollution in an area of a facility where there is none, or improvements or safety paraphernalia required by government regulation and not causally related to property damage, would not be covered as "damages.”
113 Wn.2d at 886-87 (quoting Aerojet-General Corp. v. San Mateo County Superior Court, 257 Cal. Rptr. 621, 635, supplemented by 258 Cal. Rptr. 684, review denied, Aug. 10,1989)). Given the policy we enunciated in Weyerhaeuser that voluntary cleanup is within the coverage provisions of a CGL policy, and based on the evidence here, this case is more in the nature of the Tank 1 example than the alternative.17 The trial court erred in giving instruction 22 to the jury.
Finally, another conceivable meaning for the interrogatory could be whether Olds-Olympic’s remediation efforts pertained to the groundwater or to its own property. If the intent of the interrogatory was for the jury to decide whether Olds-Olympic’s remedial efforts pertained to its own property, and not the groundwater, instructions 23 and 24 offer little help to the jury. An owned property exclusion prevents a CGL policy from providing first-party benefits to the insured. Tod I. Zuckerman and Mark C. [479]*479Raskoff, Environmental Insurance Litigation § 7.02, at 7-4 (Supp. 1994). Third party insurance involves protection for the policyholder for liability it incurs to someone else, while first party insurance involves protection for losses to the policyholder’s own property. Weyerhaeuser, 123 Wn.2d at 909.18
The jury here determined there was injury to the groundwater, the property of the State. The "owned property” exclusions did not apply to Olds-Olympic because the groundwater at issue in this case was neither owned nor within the "care, custody, or control” of OldsOlympic.19 In Madden v. Vitamilk Dairy, Inc., 59 Wn.2d 237, 367 P.2d 127 (1961), we indicated the words "care, custody or control” in a CGL policy are unambiguous and must be given their plain, ordinary meaning. We stated:
[480]*480Where the property damaged is merely incidental to the property upon which the work is being performed by the insured, the exclusion is not applicable. . . . However, where the property damaged is under the supervision of the insured and is a necessary element of the work involved, the property is in the "care, custody, or control” of the insured.
Id. at 239 (quoting International Derrick & Equip. Co. v. Buxbaum, 240 F.2d 536 (1957)).
The plain language of "care, custody, or control” does not support application of the owned property exclusion here. Groundwater was not essential to Olds-Olympic’s business. The State did not grant a permit for use of the groundwater to Olds-Olympic. Moreover, there is nothing in the record to indicate Olds-Olympic asserted control over the groundwater. Consequently, the owned property exclusion is inapplicable here with respect to the groundwater.20
In summary, the trial court’s instructions on legal liability were insufficient to advise the jury of the circumstances under which legal liability for cleanup of the State’s groundwater would be present. The jury’s answer to interrogatory 8 was therefore ambiguous. A retrial is necessary to obtain a definite determination of the crucial issue in this case.
4. THE INSURERS’ LATE NOTICE DEFENSE
Both the Commercial Union and Fireman’s Fund policies contained substantially similar notice requirements, which provided in pertinent part:
Such notice shall contain particulars sufficient to identify the insured and also reasonably obtainable information with respect to the time, place and circumstances thereof!,] and the names and addresses of the injured and if available!,] wit[481]*481nesses shall be given by or for the insured to the company or any of its authorized agents as soon as practicable.
Olds-Olympic notified the insurers of the loss "as soon as practicable” even though the events producing the loss occurred much earlier. Tradewell Stores, Inc. v. Fidelity & Casualty Co., 67 Wn.2d 919, 410 P.2d 782 (1966) (duty to notify "as soon as practicable” satisfied when insured notified insurer after it acquired actual knowledge of the loss). Thus, we hold there was no late notice in this case, and we remand for dismissal of the late notice defense.21
CONCLUSION
The jury in this case made the necessary factual determination to support coverage under the CGL policies. It determined there was damage to the property of another (the State’s groundwater) caused by an occurrence.
The jury then determined Olds-Olympic had no legal obligation or liability to the State for that property damage. The jury could have made such a determination had it been properly instructed on the law. But the basis for the jury’s determination is unclear. We cannot know if the jury found the property damage to the groundwater did not meet MTCA levels, or if Olds-Olympic’s actions were voluntary and preventative, or if Olds-Olympic remedied damage only to its own property rather than the groundwater. In the absence of instructions properly guiding the jury in its answer to interrogatory 8, a new trial must take place.
We reverse the judgment of the King County Superior Court and remand the case for a new trial [482]*482confined to the issue of Olds-Olympic’s legal liability to the State, and damages, if any.22
Durham, C.J., Dolliver, Smith, Johnson, Madsen, and Alexander, JJ., and Pekelis, J. Pro Tern., concur.