Non-Transient Non-Community · PWSID CA3701010

Warner Unified School District

Serves 250 peopleGroundwaterOwner: Local GovernmentWarner Springs, CaliforniaServes a school or daycare
Nothing open right now.

On record since 2016: 38 violations. 38 over the limit. 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.

38Over the limit
0Treatment lapse
0Missed 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

2005201020152016 · Over the limit: 42016 · Over the limit: 42016 · Over the limit: 42016 · Over the limit: 42017 · Over the limit: 42017 · Over the limit: 42017 · Over the limit: 42017 · Over the limit: 42018 · Over the limit: 42018 · Over the limit: 42018 · Over the limit: 42018 · Over the limit: 42019 · 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: 42025 · 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.
100% over the limit · 38

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×+Arsenic2024-10-01 · Arsenic: measured 11.90 UG/L vs limit 10.00 UG/L (1.2×)2024-04-01 · Arsenic: measured 19.50 UG/L vs limit 10.00 UG/L (1.9×)2024-01-01 · Arsenic: measured 14.00 MG/L vs limit 10.00 MG/L (1.4×)2023-10-01 · Arsenic: measured 16.20 UG/L vs limit 10.00 UG/L (1.6×)2023-07-01 · Arsenic: measured 23.60 UG/L vs limit 10.00 UG/L (2.4×)2023-04-01 · Arsenic: measured 20.30 UG/L vs limit 10.00 UG/L (2.0×)2023-01-01 · Arsenic: measured 16.60 UG/L vs limit 10.00 UG/L (1.7×)2022-10-01 · Arsenic: measured 12.90 UG/L vs limit 10.00 UG/L (1.3×)2022-07-01 · Arsenic: measured 15.80 UG/L vs limit 10.00 UG/L (1.6×)2022-04-01 · Arsenic: measured 13.00 UG/L vs limit 10.00 UG/L (1.3×)2022-01-01 · Arsenic: measured 17.50 UG/L vs limit 10.00 UG/L (1.8×)2021-10-01 · Arsenic: measured 13.60 UG/L vs limit 10.00 UG/L (1.4×)2021-07-01 · Arsenic: measured 15.60 UG/L vs limit 10.00 UG/L (1.6×)2021-04-01 · Arsenic: measured 25.30 UG/L vs limit 10.00 UG/L (2.5×)2018-04-01 · Arsenic: measured 0.0166 MG/L vs limit 0.005000 MG/L (3.3×)2018-01-01 · Arsenic: measured 0.0189 MG/L vs limit 0.005000 MG/L (3.8×)2017-10-01 · Arsenic: measured 0.0184 MG/L vs limit 0.005000 MG/L (3.7×)2017-07-01 · Arsenic: measured 0.0218 MG/L vs limit 0.005000 MG/L (4.4×)2017-04-01 · Arsenic: measured 0.0350 MG/L vs limit 0.0100 MG/L (3.5×)2017-01-01 · Arsenic: measured 0.0156 MG/L vs limit 0.0100 MG/L (1.6×)2016-10-01 · Arsenic: measured 0.0136 MG/L vs limit 0.0100 MG/L (1.4×)2016-07-01 · Arsenic: measured 0.0116 MG/L vs limit 0.0100 MG/L (1.2×)2016-04-01 · Arsenic: measured 0.0117 MG/L vs limit 0.0100 MG/L (1.2×)2016-01-01 · Arsenic: measured 0.0106 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 3 results on file · action level 15 ppb

5 ppb
0 ppb
0 ppb

Every violation on record

  1. 2025-04-01ArsenicMCL, Averagemeasured 11.90 UG/LPeriod ended · no return to compliance on file
  2. 2025-01-01ArsenicMCL, Averagemeasured 20.70 UG/LPeriod ended · no return to compliance on file
  3. 2024-10-01ArsenicMCL, Averagemeasured 11.90 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  4. 2024-07-01ArsenicMCL, Averagemeasured 21.60 UG/LPeriod ended · no return to compliance on file
  5. 2024-04-01ArsenicMCL, Averagemeasured 19.50 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  6. 2024-01-01ArsenicMCL, Averagemeasured 14.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  7. 2023-10-01ArsenicMCL, Averagemeasured 16.20 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  8. 2023-07-01ArsenicMCL, Averagemeasured 23.60 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  9. 2023-04-01ArsenicMCL, Averagemeasured 20.30 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  10. 2023-01-01ArsenicMCL, Averagemeasured 16.60 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  11. 2022-10-01ArsenicMCL, Averagemeasured 12.90 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  12. 2022-07-01ArsenicMCL, Averagemeasured 15.80 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  13. 2022-04-01ArsenicMCL, Averagemeasured 13.00 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  14. 2022-01-01ArsenicMCL, Averagemeasured 17.50 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  15. 2021-10-01ArsenicMCL, Averagemeasured 13.60 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  16. 2021-07-01ArsenicMCL, Averagemeasured 15.60 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  17. 2021-04-01ArsenicMCL, Averagemeasured 25.30 UG/L · limit 10.00 UG/LPeriod ended · no return to compliance on file
  18. 2021-01-01ArsenicMCL, Averagemeasured 21.50 UG/LPeriod ended · no return to compliance on file
  19. 2020-10-01ArsenicMCL, Averagemeasured 21.40 UG/LPeriod ended · no return to compliance on file
  20. 2020-07-01ArsenicMCL, Averagemeasured 20.40 UG/LPeriod ended · no return to compliance on file
  21. 2020-04-01ArsenicMCL, Averagemeasured 19.20 UG/LPeriod ended · no return to compliance on file
  22. 2020-01-01ArsenicMCL, Averagemeasured 14.30 MG/LPeriod ended · no return to compliance on file
  23. 2019-10-01ArsenicMCL, Averagemeasured 14.20 UG/LPeriod ended · no return to compliance on file
  24. 2019-07-01ArsenicMCL, Averagemeasured 14.70 UG/LPeriod ended · no return to compliance on file
  25. 2019-04-01ArsenicMCL, Averagemeasured 16.00 UG/LPeriod ended · no return to compliance on file
Show the other 13 entries
  1. 2019-01-01ArsenicMCL, Averagemeasured 21.00 UG/LPeriod ended · no return to compliance on file
  2. 2018-10-01ArsenicMCL, Averagemeasured 21.00 UG/LPeriod ended · no return to compliance on file
  3. 2018-07-01ArsenicMCL, Averagemeasured 15.00 UG/LPeriod ended · no return to compliance on file
  4. 2018-04-01ArsenicMCL, Averagemeasured 0.0166 MG/L · limit 0.005000 MG/LPeriod ended · no return to compliance on file
  5. 2018-01-01ArsenicMCL, Averagemeasured 0.0189 MG/L · limit 0.005000 MG/LPeriod ended · no return to compliance on file
  6. 2017-10-01ArsenicMCL, Averagemeasured 0.0184 MG/L · limit 0.005000 MG/LPeriod ended · no return to compliance on file
  7. 2017-07-01ArsenicMCL, Averagemeasured 0.0218 MG/L · limit 0.005000 MG/LPeriod ended · no return to compliance on file
  8. 2017-04-01ArsenicMCL, Averagemeasured 0.0350 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  9. 2017-01-01ArsenicMCL, Averagemeasured 0.0156 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  10. 2016-10-01ArsenicMCL, Averagemeasured 0.0136 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  11. 2016-07-01ArsenicMCL, Averagemeasured 0.0116 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  12. 2016-04-01ArsenicMCL, Averagemeasured 0.0117 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file
  13. 2016-01-01ArsenicMCL, Averagemeasured 0.0106 MG/L · limit 0.0100 MG/LPeriod ended · no return to compliance on file

System details

Population served250
Service connections15
Water sourceGroundwater
System typeNon-Transient Non-Community
OwnerLocal Government
StatusActive
CityWarner Springs
EPA ZIP on file92086

Areas served

  • San Diego County

Reading this record

Warner Unified School District is a non-transient non-community that draws from groundwater and serves about 250 people in Warner Springs, 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.