Just So You Know, the Truth About Enterprise Funds
Mariposa County’s water and sewer special districts were not legally converted into enterprise funds. They remain county service areas, sewer zones, or maintenance districts. What changed was primarily the county’s accounting structure and fund numbering.
What the records show
In 1999, county records identified Coulterville as the Coulterville County Service Area and adopted its water fees under that name.
The county’s 2015 audited statements classified the Coulterville Service Area and Don Pedro Sewer Zone 1 as non-major governmental funds. Meanwhile, Plant Operation Services was separately classified as an enterprise fund.
The FY2017–18 budget likewise showed separate utility funds for Coulterville, Lake Don Pedro, Mariposa Pines and Yosemite West, while Fund 616—Plant Operations paid the centralized employees and operating expenses.
The current FY2025–26 accounting still lists:
Fund 3314 — Coulterville Service Area
Fund 3316 — Don Pedro Sewer
Fund 3320 — Mariposa Pines
Fund 3322 — Yosemite West Maintenance District
Fund 6616 — the separate Plant Operations enterprise fund.
What probably caused the confusion
On July 1, 2021, Mariposa County changed to the Oracle financial system and adopted a new chart of accounts. The old utility fund numbers—such as 314 and 316—became numbers such as 3314 and 3316. That was an accounting and numbering change, not a legal conversion of the districts.
Plant Operations was already being reported as an enterprise fund by at least FY2013–14. I have not yet found the original Board resolution establishing that separate accounting fund.
Why Plant Operations is an enterprise fund
Plant Operations provides centralized employees, administration and technical services to the individual water and sewer systems. It charges those districts for the services provided. GASB accounting standards allow an enterprise fund when a government charges users or other funds for goods or services.
Therefore:
The districts were not converted into businesses or stripped of their special-district status. The county created a separate enterprise fund to account for the shared cost of operating their facilities.
This distinction matters because calling the districts “enterprise funds” could incorrectly suggest that they must survive exclusively on customer rates. Coulterville, Don Pedro, Mariposa Pines and Yosemite West have also received property-tax allocations, grants, loans and county transfers. Their legal formation documents and revenue entitlements did not disappear merely because Plant Operations uses enterprise accounting.
Most of those districts were created as enterprise-type utilities because they provide services (water, sewer, solid waste) directly to customers but were never intended to be financed primarily through user charges rather than general taxes. That accounting and funding model has existed for decades.
What did change over time was how much property tax support those districts received.
What happened?
Before Proposition 13 (1978)
Before Proposition 13:
Water and sewer districts commonly received a portion of their operating revenue from property taxes.
User fees were often kept relatively low because taxes helped pay for operations, maintenance, and capital improvements.
After Proposition 13
Proposition 13 dramatically reduced local property tax revenues.
The Legislature temporarily created the Special District Augmentation Fund (SDAF) to replace some of the lost revenue for special districts.
Early 1990s (ERAF)
Beginning in 1992–93, California shifted billions of dollars in local property taxes into the Educational Revenue Augmentation Fund (ERAF) to help finance schools.
That meant many local agencies—including numerous special districts—received less property tax revenue than before.
Enterprise districts became increasingly self-supporting, or so we are told.
After the removal of property taxes the only way they can be self-supporting is with exorbitant user fees. So as can be seen maintenance and capital improvements must be forsaken to keep the user feed down so the tax payer believes their systems are ok. They believed this for decades.
As property tax support declined, enterprise utilities increasingly relied on:
water rates
sewer charges
connection fees
assessments
capital grants
Instead of general tax revenues. That transition occurred gradually through the 1980s and 1990s rather than in a single action by the Mariposa County Board of Supervisors.
So what happened to the tax money?
This is where things get interesting.
The answer is it depends on which tax dollars you're referring to.
Some tax revenue never disappeared.
Property taxes are still collected.
However, after Proposition 13 and the later ERAF shifts:
schools received a larger share,
counties retained portions,
cities retained portions,
some special districts retained smaller portions,
According to California's complicated property tax allocation formulas.
In other words, much of the property tax revenue that previously helped support utility districts was reallocated through state law, not simply kept by Mariposa County.
Could the County have done more?
This is probably the heart of the current crisis:
There is a legitimate debate over whether:
the County should have contributed more General Fund support,
capital replacement should have been funded earlier,
reserves should have been built over time,
Infrastructure replacement should have been planned decades in advance instead of relying on today's ratepayers.
Those are policy decisions, and reasonable people can disagree on them.
One question I would ask?
Since 1978, how much property tax revenue was historically allocated to each Mariposa County dependent special district, and how did those allocations change after Proposition 13, SDAF, and ERAF?
That answer would show:
where the money originally went,
when funding declined,
whether the County backfilled those losses, (They didn’t)
Whether deferred maintenance resulted from lack of funding, policy choices, or both.
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