ROBERTSON, Judge.
In this case we return to our continuing struggle to define the perimeters of the Hancock Amendment and particularly of Article X, Section 22(a) of the Missouri Constitution. The specific issue is whether the respondent may raise its sewer charges without approval of district voters. The trial court held that respondent could raise its charges without a vote, relying principally on this Court’s recent decision in Keller v. Marion County Ambulance District, 820 S.W.2d 301 (Mo. banc 1991). A divided panel of the court of appeals reversed the judgment of the trial court and ordered respondent to submit its charges to the voters for approval. The court of appeals, en banc, ordered transfer of the case to this Court. We have jurisdiction, Mo. Const, art. V, § 10, and now reverse the judgment of the trial court and remand the case with directions to enter an order declaring respondent’s charges subject to Article X, Section 22(a) of the Missouri Constitution.
I.
Prior to 1954, various private and governmental entities provided sewer service to the residents of the City of St. Louis and St. Louis County. On February 9 of that year, the voters of the region adopted a plan to create the Metropolitan St. Louis Sewer District (“MSD”) to provide an integrated sewer system for the City of St. Louis and a majority of St. Louis County. The plan required the mayor of the City of St. Louis and the county executive of St. Louis County to appoint a six-member board of trustees to operate MSD. The plan also gave that board authority to impose ad valorem taxes and establish charges for sewer services. Under the plan, MSD took title to most of the existing sanitary and storm water sewer systems within the boundaries of the district. Today, MSD serves approximately 420,000 accounts, including single and multifamily dwellings and commercial and industrial customers, and owns and operates an extensive system of collector and interceptor sewers and treatment plants, all of which are subject to state and federal regulation. The continued ability of MSD to maintain and improve its sewer collection and treatment facilities and meet increasingly demanding state and federal regulations depends on MSD’s ability to provide a revenue stream sufficient for those purposes.
For residential property, the board imposes a flat fee for sewer service. The amount of the fee remains the same no matter how much waste a residential customer sends into the system. Nonresidential customers pay a base charge plus a charge measured by the volume of waste the property adds to the system. Nearly all of the property owners within MSD receive MSD sewer charges. Failure to pay a sewer charge results in a hen against real property by operation of law. MSD is quick to point out, however, that approximately 9,000 parcels of property do not use the system and pay no service charge. These parcels escape the charge because they have an alternate means of sewage disposal or are unimproved.
Appellant Richard Beatty is a resident of St. Louis County, Missouri, owns real property there, and pays sewer charges imposed by MSD. In 1985, facing additional regulatory pressures and maintenance costs, MSD issued revenue bonds and increased its sewer charges to meet debt service on the bonds [219]*219and to operate and maintain the sewer system. MSD imposed these increased charges without voter approval. Mr. Beatty filed an action challenging MSD’s authority to issue revenue bonds and increase its charges without a vote of the people. Mr. Beatty contended that Article X, Section 22(a) of the Missouri Constitution prohibited such an increase without voter approval. The court of appeals reversed the trial court’s judgment that held that MSD had authority to issue the revenue bonds in question. Beatty v. Metropolitan St. Louis Sewer District, 731 S.W.2d 318 (Mo.App.1987) (en banc). Because MSD did not have authority to issue the revenue bonds, the user fees imposed in conjunction with the bond issue without voter approval violated Article X, Section 22(a). Following the court of appeals’ decision, MSD entered into a consent decree and agreed that Article X, Section 22(a), applied to the sewer charges at issue in the case. MSD submitted the question of increasing its user charges to the voters in 1988. The voters approved the increases in wastewater charges (to $4.18 per month), capital improvement charges ($6.50 per month), and storm sewer charges ($0.24 per month).
In February, 1990, MSD sought the voters’ permission to increase its sewer charges again. The voters rejected the increase.
On December 17, 1991, this Court issued its decision in Keller. A deeply divided Court held that a local ambulance district’s increased charges for ambulance service were not fees within the meaning of Article X, Section 22(a). MSD read Keller in light of its financial needs and increased its wastewa-ter charges by $4.00 per month without voter approval. Claiming a purpose to avoid rate shock, MSD’s new charges did not change the gross monthly single-family residential bill; it remained at $10.29 per month. Instead, MSD offset the wastewater charge increase of $4.00 with a reduction in the capital improvement surcharge by a corresponding $4.00.
On June 17, 1992, Mr. Beatty and others filed a new action (Beatty II) in St. Louis County claiming that the decision in Beatty I was res judicata, required MSD to submit any increase in sewer charges to the voters for approval and, in any event, seeking a declaration that MSD’s failure to submit its new charges to the voters for approval violated Article X, Section 22(a). MSD filed a motion to reopen Beatty I, seeking relief from the judgment in Beatty I, on June 26, 1992. That same day, MSD filed its motion to consolidate Beatty I and Beatty II. Ultimately, the trial court sustained these motions and consolidated the two cases. In none of its legal papers did MSD seek to recover sewer charges it lost as a result of the decision in Beatty I or to apply a favorable decision in Beatty II retroactively.
The trial court heard evidence, applied Keller, and held that the new sewer charges did not fall under Article X, Section 22(a). This appeal followed.
II.
Article X, Section 22(a), prohibits a political subdivision of this state “from increasing the current levy of an existing tax, license or fees [sic], above that current levy authorized by law or charter when this section is adopted without the approval of the required majority of the qualified voters of that ... political subdivision voting thereon.” MSD is a political subdivision of the state. Thus, the question before the Court is whether the sewer charge imposed by MSD is a “tax, license or fees” [sic] within the meaning of Article X, Section 22(a). If so, such charges cannot be increased without prior voter approval. In considering this question, we assume that MSD’s silence on the issue is tantamount to an admission that the four dollar increase in the wastewater service charge constitutes an increase in the charges MSD requires its residential customers to pay.
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ROBERTSON, Judge.
In this case we return to our continuing struggle to define the perimeters of the Hancock Amendment and particularly of Article X, Section 22(a) of the Missouri Constitution. The specific issue is whether the respondent may raise its sewer charges without approval of district voters. The trial court held that respondent could raise its charges without a vote, relying principally on this Court’s recent decision in Keller v. Marion County Ambulance District, 820 S.W.2d 301 (Mo. banc 1991). A divided panel of the court of appeals reversed the judgment of the trial court and ordered respondent to submit its charges to the voters for approval. The court of appeals, en banc, ordered transfer of the case to this Court. We have jurisdiction, Mo. Const, art. V, § 10, and now reverse the judgment of the trial court and remand the case with directions to enter an order declaring respondent’s charges subject to Article X, Section 22(a) of the Missouri Constitution.
I.
Prior to 1954, various private and governmental entities provided sewer service to the residents of the City of St. Louis and St. Louis County. On February 9 of that year, the voters of the region adopted a plan to create the Metropolitan St. Louis Sewer District (“MSD”) to provide an integrated sewer system for the City of St. Louis and a majority of St. Louis County. The plan required the mayor of the City of St. Louis and the county executive of St. Louis County to appoint a six-member board of trustees to operate MSD. The plan also gave that board authority to impose ad valorem taxes and establish charges for sewer services. Under the plan, MSD took title to most of the existing sanitary and storm water sewer systems within the boundaries of the district. Today, MSD serves approximately 420,000 accounts, including single and multifamily dwellings and commercial and industrial customers, and owns and operates an extensive system of collector and interceptor sewers and treatment plants, all of which are subject to state and federal regulation. The continued ability of MSD to maintain and improve its sewer collection and treatment facilities and meet increasingly demanding state and federal regulations depends on MSD’s ability to provide a revenue stream sufficient for those purposes.
For residential property, the board imposes a flat fee for sewer service. The amount of the fee remains the same no matter how much waste a residential customer sends into the system. Nonresidential customers pay a base charge plus a charge measured by the volume of waste the property adds to the system. Nearly all of the property owners within MSD receive MSD sewer charges. Failure to pay a sewer charge results in a hen against real property by operation of law. MSD is quick to point out, however, that approximately 9,000 parcels of property do not use the system and pay no service charge. These parcels escape the charge because they have an alternate means of sewage disposal or are unimproved.
Appellant Richard Beatty is a resident of St. Louis County, Missouri, owns real property there, and pays sewer charges imposed by MSD. In 1985, facing additional regulatory pressures and maintenance costs, MSD issued revenue bonds and increased its sewer charges to meet debt service on the bonds [219]*219and to operate and maintain the sewer system. MSD imposed these increased charges without voter approval. Mr. Beatty filed an action challenging MSD’s authority to issue revenue bonds and increase its charges without a vote of the people. Mr. Beatty contended that Article X, Section 22(a) of the Missouri Constitution prohibited such an increase without voter approval. The court of appeals reversed the trial court’s judgment that held that MSD had authority to issue the revenue bonds in question. Beatty v. Metropolitan St. Louis Sewer District, 731 S.W.2d 318 (Mo.App.1987) (en banc). Because MSD did not have authority to issue the revenue bonds, the user fees imposed in conjunction with the bond issue without voter approval violated Article X, Section 22(a). Following the court of appeals’ decision, MSD entered into a consent decree and agreed that Article X, Section 22(a), applied to the sewer charges at issue in the case. MSD submitted the question of increasing its user charges to the voters in 1988. The voters approved the increases in wastewater charges (to $4.18 per month), capital improvement charges ($6.50 per month), and storm sewer charges ($0.24 per month).
In February, 1990, MSD sought the voters’ permission to increase its sewer charges again. The voters rejected the increase.
On December 17, 1991, this Court issued its decision in Keller. A deeply divided Court held that a local ambulance district’s increased charges for ambulance service were not fees within the meaning of Article X, Section 22(a). MSD read Keller in light of its financial needs and increased its wastewa-ter charges by $4.00 per month without voter approval. Claiming a purpose to avoid rate shock, MSD’s new charges did not change the gross monthly single-family residential bill; it remained at $10.29 per month. Instead, MSD offset the wastewater charge increase of $4.00 with a reduction in the capital improvement surcharge by a corresponding $4.00.
On June 17, 1992, Mr. Beatty and others filed a new action (Beatty II) in St. Louis County claiming that the decision in Beatty I was res judicata, required MSD to submit any increase in sewer charges to the voters for approval and, in any event, seeking a declaration that MSD’s failure to submit its new charges to the voters for approval violated Article X, Section 22(a). MSD filed a motion to reopen Beatty I, seeking relief from the judgment in Beatty I, on June 26, 1992. That same day, MSD filed its motion to consolidate Beatty I and Beatty II. Ultimately, the trial court sustained these motions and consolidated the two cases. In none of its legal papers did MSD seek to recover sewer charges it lost as a result of the decision in Beatty I or to apply a favorable decision in Beatty II retroactively.
The trial court heard evidence, applied Keller, and held that the new sewer charges did not fall under Article X, Section 22(a). This appeal followed.
II.
Article X, Section 22(a), prohibits a political subdivision of this state “from increasing the current levy of an existing tax, license or fees [sic], above that current levy authorized by law or charter when this section is adopted without the approval of the required majority of the qualified voters of that ... political subdivision voting thereon.” MSD is a political subdivision of the state. Thus, the question before the Court is whether the sewer charge imposed by MSD is a “tax, license or fees” [sic] within the meaning of Article X, Section 22(a). If so, such charges cannot be increased without prior voter approval. In considering this question, we assume that MSD’s silence on the issue is tantamount to an admission that the four dollar increase in the wastewater service charge constitutes an increase in the charges MSD requires its residential customers to pay. This decision, while predicated on MSD’s tacit admission, does not decide the question whether the constitution requires voters to approve a political subdivision’s decision to increase part of its fees and decrease another part where the amount due from the fee payer remains the same.
A.
Mr. Beatty begins his brief with what he believes is a procedural coup de grace. He claims that Rule 74.06(b)(5) does not per[220]*220mit the trial court to relieve MSD of the final judgment in Beatty I, that the consent decree in Beatty I is res judicata* and that MSD’s consent decree in Beatty I estops MSD from claiming now that it may raise its sewer charges without voter approval.
While Mr. Beatty presents an interesting academic question, it is unavailing in this context. First, Keller raises a legitimate legal question as to whether MSD’s charges fall under Article X, Section 22(a). Second, in apparent recognition of this fact and in response to MSD’s interpretation of Keller, Mr. Beatty himself filed an independent action challenging MSD’s increased sewer charges prior to MSD seeking to reopen the Beatty I decision. MSD’s motion raises the identical, ultimate legal question joined by Mr. Beatty in his second suit. The trial court’s decision to consolidate Beatty I and Beatty II and decide only the genuine legal issue raised in Beatty II eliminates Mr. Beatty’s procedural claim. The point is denied.
B.
Keller overruled Roberts v. McNary, 636 S.W.2d 332 (Mo. banc 1982). In doing so, Keller rejected “the contention that all fees— whether user fees or tax-fees — are subject to the Hancock Amendment.” 820 S.W.2d at 304. To assist in determining whether a governmental charge is a tax within the meaning of Article X, Section 22(a), or user fee not subject to constitutional controls, Keller suggested a five-pronged analysis. Keller, 820 S.W.2d at 304-6, n. 10.
Mr. Beatty urges that we overrule Keller as wrongly decided. While the Court will continue to assess the wisdom and viability of Keller’s holding in appropriate cases, we need not decide Keller’s ultimate fate in this case. Application of the Keller test requires that MSD submit its sewer charge increase to the voters for approval in advance of implementation.
1.When Is the Fee Paid?
Keller informs that fees subject to Article X, Section 22(a), are “likely due to be paid on a periodic basis while fees not subject to [Article X, Section 22(a) ] are likely due to be paid only on, or after provision of a good or service to the individual paying the fee.” Id. at 304. Mr. Beatty argues that the sewer charge is paid on a periodic basis and thus falls within Keller’s first test for inclusion within Article X, Section 22(a). MSD counters that sewer charges are payments for services rendered by MSD to the sewer customer and are thus goods or services under Keller’s initial test.
MSD misunderstands the first Keller test. The question posed there is not whether the political subdivision provides a service but the regularity with which the fee is paid. In this case, the fee is imposed and paid on a periodic — quarterly—basis. Because the first Keller test concerns itself only with timing, we resolve the first issue in favor of Mr. Beatty’s position.
2.Who Pays the Fee?
Keller says that a fee subject to Article X, Section 22(a) is “likely to be blanket-billed to all or almost all of the residents of the political subdivision while a fee not subject to [Article X, Section 22(a)] is likely to be charged only to those who actually use the good or service for which the fee is charged.” Id. at 304. The record in this case reveals that only 9,000 of the approximately 420,000 parcels of real estate in the district are not subject to MSD charges. Mr. Beatty argues that this is “almost all;” MSD argues that only those persons receiving its sewer service pay the fee. While it is true that almost all residents of the district pay the charge, it is also true that only those persons who actually use MSD’s services pay the charge. On application of the second prong of the Keller test, MSD has the better side of the argument.
3.Is the Amount of the Fee to Be Paid Affected by the Level of Goods or Services Provided to the Fee Payer?
The third Keller test suggests that fees subject to Article X, Section 22(a) are “less likely to be dependent on the level of goods or services provided to the fee payer while fees not subject to [Article X, Section 22(a) ] are likely to be dependent on the level of goods or services provided to the fee payer.” [221]*221Id. at 304. Mr. Beatty argues that the charge imposed by MSD bears no relation to the amount of the services MSD provides its customers; MSD argues that its charges, though admittedly uniform, reflect the estimated, average use a residential customer makes of MSD’s services and, as to nonresi-dentiai customers, bears a direct relationship to the amount of service received.
Keller’s third test focuses on the individual paying the fee. In order for a governmental charge to appear to be a user fee under Keller’s third criteria, the charge imposed must bear a direct relationship to the level of services a “fee payer” actually receives from the political subdivision. If MSD’s argument as to residential customers were correct, every tax, license, or fee would appear more like a user fee than an Article X, Section 22(a) tax. An economist could easily construct a model to show that any fee government collects is based on the “estimated, annual” use of governmental services by a taxpayer. Because the vast majority of MSD fee payers are residential, we conclude that Mr. Beatty has the better argument here.
4. Is the Government Providing a Service or Good?
The fourth Keller factor asks whether the charge paid by the “fee payer” is directly related to a service provided by a political subdivision. This factor distinguishes non-Article X, Section 22(a) fees from taxes generally, the latter being paid without relation to any specific service provided by government. On this fourth factor, MSD prevails; it clearly provides a service in return for a direct payment.
5. Has the Activity Been Historically and Exclusively Provided by the Government?
Each of the parties in this case points to a plethora of historical examples of the private or public provision of sewer services to assist their position. Application of the fifth factor is inconclusive, given the mix of public and private entities that have supplied sewer service historically.
In sum, application of the Keller test to the facts of this case provides no clear answer as to the nature of MSD’s charges.
C.
Reduced to its essence, the Hancock Amendment reveals the voters’ basic distrust of the ability of representative government to keep its taxing and spending requirements in check. As an additional bulwark against local government abuse of its power to tax, the voters amended the constitution to guarantee themselves the right to approve increases in taxes proposed by political subdivisions of the state. Whether a governmental charge is a tax is the issue with which Keller struggled. And as Keller shows, the language employed in Article X, Section 22(a), is ambiguous.
In the face of ambiguous language in the organic document of the state, this Court is required to attempt to ascertain the intent of the voters from the language they adopted and to resolve doubts as to meaning in favor of that intent. Where, as here, genuine doubt exists as to the nature of the charge imposed by local government, we resolve our uncertainty in favor of the voter’s right to exercise the guarantees they provided for themselves in the constitution.
As we have previously said, the facts of this case do not clearly define the nature of MSD’s charges. Only fee payers who use its services pay for MSD’s services. The charge imposed, however, is not directly related to the amount of services an individual, residential fee payer uses. In the end, our uncertainty as to the nature of the charge MSD imposes is heightened by the fact that unpaid sewer charges trigger a lien against real property by operation of law. Thus, we resolve our doubts in favor of the taxpayers and hold that MSD’s charges are subject to Article X, Section 22(a), and may not be increased without prior voter approval.
III.
The judgment of the trial court is reversed and the cause remanded.
[222]*222COVINGTON, C.J., and BENTON, THOMAS, PRICE, and LIMBAUGH, JJ., concur.
HOLSTEIN, J., concurs in result in separate opinion filed.