Community Water System · PWSID CA2000729

Madera Co Sa16 Sumner Hill

Serves 135 peopleSurface WaterOwner: Local GovernmentMadera, California
Nothing open right now.

On record since 2005: 62 violations. 54 over the limit · 6 treatment lapses · 2 missed or late tests. Most recent began 2025-07-01.

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

54Over the limit
6Treatment lapse
2Missed or late test
0Notice or report

More violations on record than 98% 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

2005 · Missed or late test: 1200520102015 · Treatment lapse: 120152016 · Over the limit: 72016 · Over the limit: 72016 · Over the limit: 72016 · Over the limit: 72016 · Over the limit: 72016 · Over the limit: 72016 · Over the limit: 72017 · Over the limit: 72017 · Over the limit: 72017 · Over the limit: 72017 · Over the limit: 72017 · Over the limit: 72017 · Over the limit: 72017 · Over the limit: 72017 · Treatment lapse: 12018 · Over the limit: 72018 · Over the limit: 72018 · Over the limit: 72018 · Over the limit: 72018 · Over the limit: 72018 · Over the limit: 72018 · Over the limit: 72018 · Treatment lapse: 12018 · Missed or late test: 12019 · Over the limit: 82019 · Over the limit: 82019 · Over the limit: 82019 · Over the limit: 82019 · Over the limit: 82019 · Over the limit: 82019 · Over the limit: 82019 · Over the limit: 82020 · Over the limit: 22020 · Over the limit: 220202022 · Over the limit: 32022 · Over the limit: 32022 · Over the limit: 32023 · Over the limit: 62023 · Over the limit: 62023 · Over the limit: 62023 · Over the limit: 62023 · Over the limit: 62023 · Over the limit: 62023 · Treatment lapse: 32023 · Treatment lapse: 32023 · Treatment lapse: 32024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82025 · Over the limit: 62025 · Over the limit: 62025 · Over the limit: 62025 · Over the limit: 62025 · Over the limit: 62025 · Over the limit: 62025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
87% over the limit · 5410% treatment lapse · 63% missed or late test · 2

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×+Total Haloacetic Acids (HAA5)Trihalomethanes (TTHM)2025-07-01 · Total Haloacetic Acids (HAA5): measured 0.1400 MG/L vs limit 0.0600 MG/L (2.3×)2025-07-01 · Trihalomethanes (TTHM): measured 0.1052 MG/L vs limit 0.0800 MG/L (1.3×)2025-04-01 · Total Haloacetic Acids (HAA5): measured 0.1280 MG/L vs limit 0.0600 MG/L (2.1×)2025-04-01 · Trihalomethanes (TTHM): measured 0.1030 MG/L vs limit 0.0800 MG/L (1.3×)2025-01-01 · Total Haloacetic Acids (HAA5): measured 0.1340 MG/L vs limit 0.0600 MG/L (2.2×)2025-01-01 · Trihalomethanes (TTHM): measured 0.1060 MG/L vs limit 0.0800 MG/L (1.3×)2024-10-01 · Total Haloacetic Acids (HAA5): measured 0.1078 MG/L vs limit 0.0600 MG/L (1.8×)2024-10-01 · Trihalomethanes (TTHM): measured 0.0835 MG/L vs limit 0.0800 MG/L (1.0×)2024-07-01 · Trihalomethanes (TTHM): measured 0.0890 MG/L vs limit 0.0800 MG/L (1.1×)2024-07-01 · Total Haloacetic Acids (HAA5): measured 0.1020 MG/L vs limit 0.0600 MG/L (1.7×)2024-04-01 · Total Haloacetic Acids (HAA5): measured 0.1020 MG/L vs limit 0.0600 MG/L (1.7×)2024-04-01 · Trihalomethanes (TTHM): measured 0.1020 MG/L vs limit 0.0800 MG/L (1.3×)2024-01-01 · Total Haloacetic Acids (HAA5): measured 0.1150 MG/L vs limit 0.0600 MG/L (1.9×)2024-01-01 · Trihalomethanes (TTHM): measured 0.1120 MG/L vs limit 0.0800 MG/L (1.4×)2023-10-01 · Total Haloacetic Acids (HAA5): measured 0.1150 MG/L vs limit 0.0600 MG/L (1.9×)2023-10-01 · Trihalomethanes (TTHM): measured 0.1210 MG/L vs limit 0.0800 MG/L (1.5×)2023-07-01 · Total Haloacetic Acids (HAA5): measured 0.0980 MG/L vs limit 0.0600 MG/L (1.6×)2023-07-01 · Trihalomethanes (TTHM): measured 0.1130 MG/L vs limit 0.0800 MG/L (1.4×)2023-01-01 · Total Haloacetic Acids (HAA5): measured 0.1500 MG/L vs limit 0.0600 MG/L (2.5×)2023-01-01 · Trihalomethanes (TTHM): measured 0.1300 MG/L vs limit 0.0800 MG/L (1.6×)2022-10-01 · Total Haloacetic Acids (HAA5): measured 0.0735 UG/L vs limit 0.0600 UG/L (1.2×)2022-07-01 · Total Haloacetic Acids (HAA5): measured 74.50 UG/L vs limit 60.00 UG/L (1.2×)2022-04-01 · Total Haloacetic Acids (HAA5): measured 68.80 UG/L vs limit 60.00 UG/L (1.1×)2020-04-01 · Total Haloacetic Acids (HAA5): measured 0.0740 MG/L vs limit 0.0600 MG/L (1.2×)2020-01-01 · Total Haloacetic Acids (HAA5): measured 0.0840 UG/L vs limit 0.0600 UG/L (1.4×)2019-10-01 · Total Haloacetic Acids (HAA5): measured 0.1360 MG/L vs limit 0.0600 MG/L (2.3×)2019-10-01 · Trihalomethanes (TTHM): measured 0.1170 MG/L vs limit 0.0800 MG/L (1.5×)2019-07-01 · Total Haloacetic Acids (HAA5): measured 0.1600 MG/L vs limit 0.0600 MG/L (2.7×)2019-07-01 · Trihalomethanes (TTHM): measured 0.1310 MG/L vs limit 0.0800 MG/L (1.6×)2019-04-01 · Total Haloacetic Acids (HAA5): measured 0.1620 MG/L vs limit 0.0600 MG/L (2.7×)2019-04-01 · Trihalomethanes (TTHM): measured 0.1370 MG/L vs limit 0.0800 MG/L (1.7×)2019-01-01 · Total Haloacetic Acids (HAA5): measured 0.1950 MG/L vs limit 0.0600 MG/L (3.3×)2019-01-01 · Trihalomethanes (TTHM): measured 0.1310 MG/L vs limit 0.0800 MG/L (1.6×)2018-10-01 · Total Haloacetic Acids (HAA5): measured 0.1480 MG/L vs limit 0.0600 MG/L (2.5×)2018-10-01 · Trihalomethanes (TTHM): measured 0.1030 MG/L vs limit 0.0800 MG/L (1.3×)2018-07-01 · Total Haloacetic Acids (HAA5): measured 0.1320 MG/L vs limit 0.0600 MG/L (2.2×)2018-07-01 · Trihalomethanes (TTHM): measured 0.1050 MG/L vs limit 0.0800 MG/L (1.3×)2018-04-01 · Total Haloacetic Acids (HAA5): measured 0.1090 MG/L vs limit 0.0600 MG/L (1.8×)2018-04-01 · Trihalomethanes (TTHM): measured 0.0830 MG/L vs limit 0.0800 MG/L (1.0×)2018-01-01 · Trihalomethanes (TTHM): measured 94.00 UG/L vs limit 80.00 UG/L (1.2×)2017-10-01 · Trihalomethanes (TTHM): measured 123.00 UG/L vs limit 80.00 UG/L (1.5×)2017-07-01 · Total Haloacetic Acids (HAA5): measured 63.00 UG/L vs limit 60.00 UG/L (1.1×)2017-07-01 · Trihalomethanes (TTHM): measured 135.00 UG/L vs limit 80.00 UG/L (1.7×)2017-04-01 · Total Haloacetic Acids (HAA5): measured 73.00 UG/L vs limit 60.00 UG/L (1.2×)2017-04-01 · Trihalomethanes (TTHM): measured 121.00 UG/L vs limit 80.00 UG/L (1.5×)2017-01-01 · Total Haloacetic Acids (HAA5): measured 0.1010 MG/L vs limit 0.0600 MG/L (1.7×)2017-01-01 · Trihalomethanes (TTHM): measured 0.1210 MG/L vs limit 0.0800 MG/L (1.5×)2016-10-01 · Total Haloacetic Acids (HAA5): measured 130.00 UG/L vs limit 60.00 UG/L (2.2×)2016-10-01 · Trihalomethanes (TTHM): measured 100.00 UG/L vs limit 80.00 UG/L (1.2×)2016-07-01 · Total Haloacetic Acids (HAA5): measured 102.00 UG/L vs limit 60.00 UG/L (1.7×)2016-07-01 · Trihalomethanes (TTHM): measured 88.00 UG/L vs limit 80.00 UG/L (1.1×)2016-04-01 · Total Haloacetic Acids (HAA5): measured 80.50 UG/L vs limit 60.00 UG/L (1.3×)2016-04-01 · Trihalomethanes (TTHM): measured 88.00 UG/L vs limit 80.00 UG/L (1.1×)2016-01-01 · Total Haloacetic Acids (HAA5): measured 83.00 UG/L vs limit 60.00 UG/L (1.4×)
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 4 results on file · action level 15 ppb

4 ppb
3.1 ppb
3.1 ppb
1.3 ppb

Every violation on record

  1. 2025-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1400 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  2. 2025-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1052 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  3. 2025-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1280 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  4. 2025-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1030 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  5. 2025-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1340 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  6. 2025-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1060 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  7. 2024-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1078 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  8. 2024-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0835 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  9. 2024-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0890 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  10. 2024-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1020 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  11. 2024-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1020 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  12. 2024-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1020 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  13. 2024-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1150 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  14. 2024-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1120 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  15. 2023-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1150 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  16. 2023-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1210 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  17. 2023-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0980 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  18. 2023-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1130 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  19. 2023-07-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  20. 2023-06-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  21. 2023-05-01Surface water treatment (SWTR)Treatment Technique (SWTR and GWR)Back in compliance
  22. 2023-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1500 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  23. 2023-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1300 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  24. 2022-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0735 UG/L · limit 0.0600 UG/LPeriod ended · no return to compliance on file
  25. 2022-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 74.50 UG/L · limit 60.00 UG/LPeriod ended · no return to compliance on file
Show the other 37 entries
  1. 2022-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 68.80 UG/L · limit 60.00 UG/LPeriod ended · no return to compliance on file
  2. 2020-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0740 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  3. 2020-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0840 UG/L · limit 0.0600 UG/LPeriod ended · no return to compliance on file
  4. 2019-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1360 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  5. 2019-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1170 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  6. 2019-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1600 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  7. 2019-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1310 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  8. 2019-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1620 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  9. 2019-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1370 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  10. 2019-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1950 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  11. 2019-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1310 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  12. 2018-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1480 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  13. 2018-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1030 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  14. 2018-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1320 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  15. 2018-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1050 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  16. 2018-05-01Revised Total Coliform RuleMONBack in compliance
  17. 2018-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1090 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  18. 2018-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.0830 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  19. 2018-01-01Carbon, TotalTreatment Technique Precursor RemovalBack in compliance
  20. 2018-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 94.00 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  21. 2017-10-01Carbon, TotalTreatment Technique Precursor RemovalBack in compliance
  22. 2017-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 123.00 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  23. 2017-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 63.00 UG/L · limit 60.00 UG/LPeriod ended · no return to compliance on file
  24. 2017-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 135.00 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  25. 2017-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 73.00 UG/L · limit 60.00 UG/LPeriod ended · no return to compliance on file
  26. 2017-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 121.00 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  27. 2017-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.1010 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  28. 2017-01-01Trihalomethanes (TTHM)MCL, Averagemeasured 0.1210 MG/L · limit 0.0800 MG/LPeriod ended · no return to compliance on file
  29. 2016-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 130.00 UG/L · limit 60.00 UG/LPeriod ended · no return to compliance on file
  30. 2016-10-01Trihalomethanes (TTHM)MCL, Averagemeasured 100.00 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  31. 2016-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 102.00 UG/L · limit 60.00 UG/LPeriod ended · no return to compliance on file
  32. 2016-07-01Trihalomethanes (TTHM)MCL, Averagemeasured 88.00 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  33. 2016-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 80.50 UG/L · limit 60.00 UG/LPeriod ended · no return to compliance on file
  34. 2016-04-01Trihalomethanes (TTHM)MCL, Averagemeasured 88.00 UG/L · limit 80.00 UG/LPeriod ended · no return to compliance on file
  35. 2016-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 83.00 UG/L · limit 60.00 UG/LPeriod ended · no return to compliance on file
  36. 2015-04-01Carbon, TotalTreatment Technique Precursor RemovalBack in compliance
  37. 2005-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance

System details

Population served135
Service connections43
Water sourceSurface Water
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityMadera
EPA ZIP on file93637

Areas served

  • Madera County

Reading this record

Madera Co Sa16 Sumner Hill is a community water system that draws from surface water and serves about 135 people in Madera, 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.