Community Water System · PWSID CA2000527

Yosemite Forks Est Mutual

Serves 110 peopleGroundwaterOwner: PrivateOakhurst, California
Nothing open right now.

On record since 1993: 34 violations. 31 over the limit · 3 missed or late tests. Most recent began 2025-04-01.

For this year's test results, ask the utility for its annual Consumer Confidence Report. Every community system must publish one.

31Over the limit
0Treatment lapse
3Missed or late test
0Notice or report

More violations on record than 96% of active water systems in California. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

1993 · Missed or late test: 1199520002005201020152016 · Over the limit: 22016 · Over the limit: 22017 · Over the limit: 22017 · Over the limit: 22017 · Missed or late test: 12018 · Over the limit: 12019 · Over the limit: 42019 · Over the limit: 42019 · Over the limit: 42019 · Over the limit: 42020 · Over the limit: 42020 · Over the limit: 42020 · Over the limit: 42020 · Over the limit: 420202021 · Over the limit: 42021 · Over the limit: 42021 · Over the limit: 42021 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42023 · Over the limit: 42023 · Over the limit: 42023 · Over the limit: 42023 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42024 · Over the limit: 42024 · Missed or late test: 12025 · Over the limit: 22025 · Over the limit: 22025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
91% over the limit · 319% missed or late test · 3

Across California, 52% of violations are missed or late tests and 29% are water over a limit.

How far over the limit

at the limit2×5×10×100×+ArsenicTotal Chlorine2025-04-01 · Arsenic: measured 0.0190 MG/L vs limit 0.0100 MG/L (1.9×)2025-01-01 · Arsenic: measured 0.0180 MG/L vs limit 0.0100 MG/L (1.8×)2024-10-01 · Arsenic: measured 0.0180 MG/L vs limit 0.0100 MG/L (1.8×)2024-07-01 · Arsenic: measured 0.0180 MG/L vs limit 0.0100 MG/L (1.8×)2024-04-01 · Arsenic: measured 17.50 UG/L vs limit 10.00 UG/L (1.8×)2024-01-01 · Arsenic: measured 0.0179 MG/L vs limit 0.0100 MG/L (1.8×)2023-10-01 · Arsenic: measured 0.0177 MG/L vs limit 0.0100 MG/L (1.8×)2023-07-01 · Total Chlorine: measured 16.88 UG/L vs limit 10.00 UG/L (1.7×)2023-04-01 · Arsenic: measured 17.12 UG/L vs limit 10.00 UG/L (1.7×)2023-01-01 · Arsenic: measured 17.50 UG/L vs limit 10.00 UG/L (1.8×)2022-10-01 · Arsenic: measured 0.0190 MG/L vs limit 0.0100 MG/L (1.9×)2022-07-01 · Arsenic: measured 0.0190 MG/L vs limit 0.0100 MG/L (1.9×)2022-04-01 · Arsenic: measured 0.0190 MG/L vs limit 0.0100 MG/L (1.9×)2022-01-01 · Arsenic: measured 0.0190 MG/L vs limit 0.0100 MG/L (1.9×)2021-10-01 · Arsenic: measured 0.0190 MG/L vs limit 0.0100 MG/L (1.9×)2021-07-01 · Arsenic: measured 0.0187 MG/L vs limit 0.0100 MG/L (1.9×)2021-04-01 · Arsenic: measured 0.0185 MG/L vs limit 0.0100 MG/L (1.8×)2021-01-01 · Arsenic: measured 0.0185 MG/L vs limit 0.0100 MG/L (1.8×)2020-10-01 · Arsenic: measured 0.0185 MG/L vs limit 0.0100 MG/L (1.8×)2020-07-01 · Arsenic: measured 0.0185 MG/L vs limit 0.0100 MG/L (1.8×)2020-04-01 · Arsenic: measured 0.0190 MG/L vs limit 0.0100 MG/L (1.9×)2020-01-01 · Arsenic: measured 0.0187 MG/L vs limit 0.0100 MG/L (1.9×)2019-10-01 · Arsenic: measured 0.0192 MG/L vs limit 0.0100 MG/L (1.9×)2019-07-01 · Arsenic: measured 0.0190 MG/L vs limit 0.0100 MG/L (1.9×)2019-04-01 · Arsenic: measured 0.0190 MG/L vs limit 0.0100 MG/L (1.9×)2019-01-01 · Arsenic: measured 0.0190 UG/L vs limit 0.0100 UG/L (1.9×)2018-01-01 · Arsenic: measured 0.0185 MG/L vs limit 0.0100 MG/L (1.8×)2017-10-01 · Arsenic: measured 0.1700 MG/L vs limit 0.0100 MG/L (17.0×)2017-01-01 · Arsenic: measured 0.0180 MG/L vs limit 0.0100 MG/L (1.8×)2016-10-01 · Arsenic: measured 0.0175 MG/L vs limit 0.0100 MG/L (1.8×)2016-07-01 · Arsenic: measured 0.0180 MG/L vs limit 0.0100 MG/L (1.8×)
Each dot is one over-the-limit violation: the measured value divided by the limit it broke, on a log scale. Most legal limits for chemicals are running averages set for a lifetime of drinking, so “just over” and “ten times over” are very different news. Hover a dot for the numbers.

Lead & copper at the tap

Utilities sample taps in homes most likely to have lead pipes, and report the 90th-percentile result: 9 in 10 homes sampled came in at or below this number. Above the red line (the action level) the utility must act. The action level is not a safe level; EPA's health goal for lead is zero. EPA's file does not date these results, so they are shown highest first.

Lead, 90th percentile 3 results on file · action level 15 ppb

10 ppb
0 ppb
0 ppb

Every violation on record

  1. 2025-04-01ArsenicMCL, Averagemeasured 0.0190 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  2. 2025-01-01ArsenicMCL, Averagemeasured 0.0180 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  3. 2024-10-01Chromium, HexMonitoring, RegularBack in compliance
  4. 2024-10-01ArsenicMCL, Averagemeasured 0.0180 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  5. 2024-07-01ArsenicMCL, Averagemeasured 0.0180 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  6. 2024-04-01ArsenicMCL, Averagemeasured 17.50 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  7. 2024-01-01ArsenicMCL, Averagemeasured 0.0179 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  8. 2023-10-01ArsenicMCL, Averagemeasured 0.0177 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  9. 2023-07-01Total ChlorineMCL, Averagemeasured 16.88 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  10. 2023-04-01ArsenicMCL, Averagemeasured 17.12 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  11. 2023-01-01ArsenicMCL, Averagemeasured 17.50 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  12. 2022-10-01ArsenicMCL, Averagemeasured 0.0190 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  13. 2022-07-01ArsenicMCL, Averagemeasured 0.0190 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  14. 2022-04-01ArsenicMCL, Averagemeasured 0.0190 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  15. 2022-01-01ArsenicMCL, Averagemeasured 0.0190 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  16. 2021-10-01ArsenicMCL, Averagemeasured 0.0190 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  17. 2021-07-01ArsenicMCL, Averagemeasured 0.0187 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  18. 2021-04-01ArsenicMCL, Averagemeasured 0.0185 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  19. 2021-01-01ArsenicMCL, Averagemeasured 0.0185 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  20. 2020-10-01ArsenicMCL, Averagemeasured 0.0185 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  21. 2020-07-01ArsenicMCL, Averagemeasured 0.0185 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  22. 2020-04-01ArsenicMCL, Averagemeasured 0.0190 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  23. 2020-01-01ArsenicMCL, Averagemeasured 0.0187 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  24. 2019-10-01ArsenicMCL, Averagemeasured 0.0192 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  25. 2019-07-01ArsenicMCL, Averagemeasured 0.0190 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
Show the other 9 entries
  1. 2019-04-01ArsenicMCL, Averagemeasured 0.0190 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  2. 2019-01-01ArsenicMCL, Averagemeasured 0.0190 UG/L · limit 0.0100 UG/LPeriod ended · no return to compliance on file
  3. 2018-01-01ArsenicMCL, Averagemeasured 0.0185 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  4. 2017-10-01ArsenicMCL, Single Samplemeasured 0.1700 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  5. 2017-04-01ArsenicMonitoring, RegularBack in compliance
  6. 2017-01-01ArsenicMCL, Averagemeasured 0.0180 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  7. 2016-10-01ArsenicMCL, Averagemeasured 0.0175 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  8. 2016-07-01ArsenicMCL, Averagemeasured 0.0180 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  9. 1993-07-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served110
Service connections99
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityOakhurst
EPA ZIP on file93644

Areas served

  • Madera County

Reading this record

Yosemite Forks Est Mutual is a community water system that draws from groundwater and serves about 110 people in Oakhurst, California. Everything above comes from the EPA's Safe Drinking Water Information System (SDWIS), where states report every violation by every public water system.

Four kinds of violation. Only one is a measurement of the water: over the limit means a test came back above a legal maximum (an MCL). A treatment lapse means a required protective step was not done, such as disinfection, filtration, fixing a defect an inspector found, or filing a lead-pipe inventory. A missed or late test means a required test was skipped or never reported. That is the most common kind, and the most misread: it does not mean the water was bad, and it does not mean the water was fine. Notices and reports covers public notices and the annual Consumer Confidence Report.

Status. “Back in compliance” means the state recorded a return to compliance. “Period ended” means the violation's compliance period is over but no return to compliance was ever filed, which is common in older records. EPA's federal copy lags state records by months, so call the utility for anything current.