Community Water System · PWSID CA1500458

R.S. Mutual Water Company

Serves 67 peopleGroundwaterOwner: PrivateWofford Heights, California
Nothing open right now.

On record since 2006: 77 violations. 70 over the limit · 7 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.

70Over the limit
0Treatment lapse
7Missed or late test
0Notice or report

More violations on record than 99% 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

20052006 · Missed or late test: 12008 · Missed or late test: 12009 · Missed or late test: 120102013 · Missed or late test: 12014 · Missed or late test: 32014 · Missed or late test: 32014 · Missed or late test: 320152016 · Over the limit: 52016 · Over the limit: 52016 · Over the limit: 52016 · Over the limit: 52016 · Over the limit: 52017 · Over the limit: 102017 · Over the limit: 102017 · Over the limit: 102017 · Over the limit: 102017 · Over the limit: 102017 · Over the limit: 102017 · Over the limit: 102017 · Over the limit: 102017 · Over the limit: 102017 · Over the limit: 102018 · Over the limit: 102018 · Over the limit: 102018 · Over the limit: 102018 · Over the limit: 102018 · Over the limit: 102018 · Over the limit: 102018 · Over the limit: 102018 · Over the limit: 102018 · Over the limit: 102018 · Over the limit: 102019 · Over the limit: 102019 · Over the limit: 102019 · Over the limit: 102019 · Over the limit: 102019 · Over the limit: 102019 · Over the limit: 102019 · Over the limit: 102019 · Over the limit: 102019 · Over the limit: 102019 · Over the limit: 102020 · Over the limit: 92020 · Over the limit: 92020 · Over the limit: 92020 · Over the limit: 92020 · Over the limit: 92020 · Over the limit: 92020 · Over the limit: 92020 · Over the limit: 92020 · Over the limit: 920202021 · Over the limit: 62021 · Over the limit: 62021 · Over the limit: 62021 · Over the limit: 62021 · Over the limit: 62021 · Over the limit: 62022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42023 · Over the limit: 62023 · Over the limit: 62023 · Over the limit: 62023 · Over the limit: 62023 · Over the limit: 62023 · Over the limit: 62024 · Over the limit: 72024 · Over the limit: 72024 · Over the limit: 72024 · Over the limit: 72024 · Over the limit: 72024 · Over the limit: 72024 · Over the limit: 72025 · Over the limit: 32025 · Over the limit: 32025 · Over the limit: 32025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
91% over the limit · 709% missed or late test · 7

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×+ArsenicCombined UraniumNitrate2023-10-01 · Arsenic: measured 0.0280 MG/L vs limit 0.0100 MG/L (2.8×)2020-01-01 · Combined Uranium: measured 31.00 PCI/L vs limit 20.00 PCI/L (1.6×)2019-10-01 · Nitrate: measured 13.00 MG/L vs limit 10.00 MG/L (1.3×)2019-10-01 · Combined Uranium: measured 30.00 PCI/L vs limit 20.00 PCI/L (1.5×)2019-10-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2019-07-01 · Nitrate: measured 13.00 MG/L vs limit 10.00 MG/L (1.3×)2018-10-01 · Combined Uranium: measured 33.00 PCI/L vs limit 20.00 PCI/L (1.6×)2018-10-01 · Nitrate: measured 12.00 MG/L vs limit 10.00 MG/L (1.2×)2018-07-01 · Combined Uranium: measured 34.00 PCI/L vs limit 20.00 PCI/L (1.7×)2018-07-01 · Nitrate: measured 13.00 MG/L vs limit 10.00 MG/L (1.3×)2018-04-01 · Combined Uranium: measured 33.00 PCI/L vs limit 20.00 PCI/L (1.6×)2018-04-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2018-04-01 · Nitrate: measured 12.00 MG/L vs limit 10.00 MG/L (1.2×)2018-01-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2018-01-01 · Combined Uranium: measured 34.00 PCI/L vs limit 20.00 PCI/L (1.7×)2018-01-01 · Nitrate: measured 13.00 MG/L vs limit 10.00 MG/L (1.3×)2017-10-01 · Combined Uranium: measured 32.00 PCI/L vs limit 20.00 PCI/L (1.6×)2017-10-01 · Nitrate: measured 12.00 MG/L vs limit 10.00 MG/L (1.2×)2017-07-01 · Combined Uranium: measured 30.00 PCI/L vs limit 20.00 PCI/L (1.5×)2017-07-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2017-07-01 · Nitrate: measured 12.00 MG/L vs limit 10.00 MG/L (1.2×)2017-04-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2017-04-01 · Combined Uranium: measured 28.00 PCI/L vs limit 20.00 PCI/L (1.4×)2017-04-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2017-01-01 · Combined Uranium: measured 25.00 PCI/L vs limit 20.00 PCI/L (1.2×)2017-01-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2016-10-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2016-07-01 · Combined Uranium: measured 23.00 PCI/L vs limit 20.00 PCI/L (1.1×)2016-07-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)2016-03-01 · Combined Uranium: measured 23.00 PCI/L vs limit 20.00 PCI/L (1.1×)2016-01-01 · Arsenic: measured 0.0110 MG/L vs limit 0.0100 MG/L (1.1×)
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 6 results on file · action level 15 ppb

50 ppb
0.7 ppb
0.6 ppb
0.5 ppb
0.5 ppb
0 ppb

Every violation on record

  1. 2025-04-01Combined UraniumMCL, Averagemeasured 24.00 PCI/LPeriod ended · no return to compliance on file
  2. 2025-04-01NitrateMCL, Single Samplemeasured 13.00 MG/LPeriod ended · no return to compliance on file
  3. 2025-01-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  4. 2024-10-01Combined UraniumMCL, Averagemeasured 24.00 PCI/LPeriod ended · no return to compliance on file
  5. 2024-10-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  6. 2024-07-01Combined UraniumMCL, Averagemeasured 25.00 PCI/LPeriod ended · no return to compliance on file
  7. 2024-07-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  8. 2024-04-01Combined UraniumMCL, Averagemeasured 23.00 PCI/LPeriod ended · no return to compliance on file
  9. 2024-01-01Combined UraniumMCL, Averagemeasured 29.00 PCI/LPeriod ended · no return to compliance on file
  10. 2024-01-01NitrateMCL, Single Samplemeasured 14.00 MG/LPeriod ended · no return to compliance on file
  11. 2023-10-01ArsenicMCL, Averagemeasured 0.0280 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  12. 2023-10-01NitrateMCL, Single Samplemeasured 13.00 MG/LPeriod ended · no return to compliance on file
  13. 2023-07-01Combined UraniumMCL, Averagemeasured 27.00 PCI/LPeriod ended · no return to compliance on file
  14. 2023-04-01Combined UraniumMCL, Averagemeasured 28.00 PCI/LPeriod ended · no return to compliance on file
  15. 2023-04-01NitrateMCL, Single Samplemeasured 13.00 MG/LPeriod ended · no return to compliance on file
  16. 2023-01-01Combined UraniumMCL, Averagemeasured 26.00 PCI/LPeriod ended · no return to compliance on file
  17. 2022-10-01Combined UraniumMCL, Averagemeasured 26.00 PCI/LPeriod ended · no return to compliance on file
  18. 2022-10-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  19. 2022-07-01Combined UraniumMCL, Averagemeasured 24.00 PCI/LPeriod ended · no return to compliance on file
  20. 2022-04-01Combined UraniumMCL, Averagemeasured 22.00 PCI/LPeriod ended · no return to compliance on file
  21. 2021-10-01Combined UraniumMCL, Averagemeasured 22.00 PCI/LPeriod ended · no return to compliance on file
  22. 2021-07-01Combined UraniumMCL, Averagemeasured 25.00 PCI/LPeriod ended · no return to compliance on file
  23. 2021-04-01Combined UraniumMCL, Averagemeasured 28.00 PCI/LPeriod ended · no return to compliance on file
  24. 2021-01-01Combined UraniumMCL, Averagemeasured 31.00 PCI/LPeriod ended · no return to compliance on file
  25. 2021-01-01ArsenicMCL, Averagemeasured 0.0110 MG/LPeriod ended · no return to compliance on file
Show the other 52 entries
  1. 2021-01-01NitrateMCL, Single Samplemeasured 14.00 MG/LPeriod ended · no return to compliance on file
  2. 2020-10-01Combined UraniumMCL, Averagemeasured 31.00 PCI/LPeriod ended · no return to compliance on file
  3. 2020-10-01ArsenicMCL, Averagemeasured 0.0110 MG/LPeriod ended · no return to compliance on file
  4. 2020-10-01NitrateMCL, Single Samplemeasured 13.00 MG/LPeriod ended · no return to compliance on file
  5. 2020-07-01Combined UraniumMCL, Averagemeasured 31.00 PCI/LPeriod ended · no return to compliance on file
  6. 2020-07-01ArsenicMCL, Averagemeasured 0.0110 MG/LPeriod ended · no return to compliance on file
  7. 2020-07-01NitrateMCL, Single Samplemeasured 13.00 MG/LPeriod ended · no return to compliance on file
  8. 2020-01-01Combined UraniumMCL, Averagemeasured 31.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  9. 2020-01-01ArsenicMCL, Averagemeasured 0.0110 MG/LPeriod ended · no return to compliance on file
  10. 2020-01-01NitrateMCL, Single Samplemeasured 14.00 MG/LPeriod ended · no return to compliance on file
  11. 2019-10-01NitrateMCL, Single Samplemeasured 13.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  12. 2019-10-01Combined UraniumMCL, Averagemeasured 30.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  13. 2019-10-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  14. 2019-07-01NitrateMCL, Single Samplemeasured 13.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  15. 2019-07-01ArsenicMCL, Averagemeasured 0.0110 MG/LPeriod ended · no return to compliance on file
  16. 2019-07-01Combined UraniumMCL, Averagemeasured 30.00 PCI/LPeriod ended · no return to compliance on file
  17. 2019-04-01Combined UraniumMCL, Averagemeasured 32.00 PCI/LPeriod ended · no return to compliance on file
  18. 2019-04-01NitrateMCL, Single Samplemeasured 13.00 MG/LPeriod ended · no return to compliance on file
  19. 2019-01-01Combined UraniumMCL, Averagemeasured 31.00 PCI/LPeriod ended · no return to compliance on file
  20. 2019-01-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  21. 2018-10-01Combined UraniumMCL, Averagemeasured 33.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  22. 2018-10-01NitrateMCL, Single Samplemeasured 12.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  23. 2018-07-01Combined UraniumMCL, Averagemeasured 34.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  24. 2018-07-01NitrateMCL, Single Samplemeasured 13.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  25. 2018-04-01Combined UraniumMCL, Averagemeasured 33.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  26. 2018-04-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  27. 2018-04-01NitrateMCL, Single Samplemeasured 12.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  28. 2018-01-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  29. 2018-01-01Combined UraniumMCL, Averagemeasured 34.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  30. 2018-01-01NitrateMCL, Single Samplemeasured 13.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  31. 2017-10-01Combined UraniumMCL, Averagemeasured 32.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  32. 2017-10-01NitrateMCL, Single Samplemeasured 12.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  33. 2017-07-01Combined UraniumMCL, Averagemeasured 30.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  34. 2017-07-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  35. 2017-07-01NitrateMCL, Single Samplemeasured 12.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  36. 2017-04-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  37. 2017-04-01Combined UraniumMCL, Averagemeasured 28.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  38. 2017-04-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  39. 2017-01-01Combined UraniumMCL, Averagemeasured 25.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  40. 2017-01-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  41. 2016-10-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  42. 2016-07-01Combined UraniumMCL, Averagemeasured 23.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  43. 2016-07-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  44. 2016-03-01Combined UraniumMCL, Averagemeasured 23.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  45. 2016-01-01ArsenicMCL, Averagemeasured 0.0110 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  46. 2014-10-01ArsenicMonitoring, RegularBack in compliance
  47. 2014-10-01NitrateMonitoring, RegularBack in compliance
  48. 2014-07-01ArsenicMonitoring, RegularBack in compliance
  49. 2013-01-01ArsenicMonitoring, RegularBack in compliance
  50. 2009-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  51. 2008-10-01ArsenicMonitoring, RegularBack in compliance
  52. 2006-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance

System details

Population served67
Service connections22
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityWofford Heights
EPA ZIP on file93285

Areas served

  • Kern County

Reading this record

R.S. Mutual Water Company is a community water system that draws from groundwater and serves about 67 people in Wofford Heights, 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.