Community Water System · PWSID CA3701341

Quiet Oaks Mobile Home Park

Serves 120 peopleGroundwaterOwner: PrivateStockton, California
Nothing open right now.

On record since 1993: 65 violations. 59 over the limit · 3 missed or late tests · 3 notices or reports. Most recent began 2025-01-01.

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

59Over the limit
0Treatment lapse
3Missed or late test
3Notice 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

1993 · Missed or late test: 1199520002005 · Missed or late test: 12005 · Notice or report: 120052008 · Notice or report: 12009 · Missed or late test: 12009 · Notice or report: 120102011 · Over the limit: 12013 · Over the limit: 72013 · Over the limit: 72013 · Over the limit: 72013 · Over the limit: 72013 · Over the limit: 72013 · Over the limit: 72013 · Over the limit: 72014 · Over the limit: 72014 · Over the limit: 72014 · Over the limit: 72014 · Over the limit: 72014 · Over the limit: 72014 · Over the limit: 72014 · Over the limit: 72015 · Over the limit: 42015 · Over the limit: 42015 · Over the limit: 42015 · Over the limit: 420152016 · 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: 52018 · Over the limit: 52018 · Over the limit: 52018 · Over the limit: 52018 · Over the limit: 52019 · Over the limit: 72019 · Over the limit: 72019 · Over the limit: 72019 · Over the limit: 72019 · Over the limit: 72019 · Over the limit: 72019 · Over the limit: 72020 · 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: 32022 · Over the limit: 32022 · Over the limit: 32023 · 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: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
91% over the limit · 595% missed or late test · 35% notice or report · 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×+NitrateNitrate-Nitrite2025-01-01 · Nitrate: measured 12.00 MG/L vs limit 10.00 MG/L (1.2×)2024-10-01 · Nitrate: measured 16.00 MG/L vs limit 10.00 MG/L (1.6×)2024-07-01 · Nitrate: measured 14.00 MG/L vs limit 10.00 MG/L (1.4×)2024-04-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2024-01-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2023-10-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2023-07-01 · Nitrate: measured 12.00 MG/L vs limit 10.00 MG/L (1.2×)2023-04-01 · Nitrate: measured 12.00 MG/L vs limit 10.00 MG/L (1.2×)2023-01-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2022-07-01 · Nitrate: measured 18.00 MG/L vs limit 10.00 MG/L (1.8×)2022-04-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2022-01-01 · Nitrate: measured 12.00 MG/L vs limit 10.00 MG/L (1.2×)2021-10-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2021-07-01 · Nitrate: measured 14.00 MG/L vs limit 10.00 MG/L (1.4×)2021-04-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2021-01-01 · Nitrate: measured 14.00 MG/L vs limit 10.00 MG/L (1.4×)2018-04-01 · Nitrate-Nitrite: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2018-01-01 · Nitrate-Nitrite: measured 10.00 MG/L vs limit 9.00 MG/L (1.1×)2017-10-01 · Nitrate-Nitrite: measured 10.00 MG/L vs limit 9.00 MG/L (1.1×)2017-07-01 · Nitrate: measured 10.10 MG/L vs limit 10.00 MG/L (1.0×)2017-04-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2017-01-01 · Nitrate: measured 14.00 MG/L vs limit 10.00 MG/L (1.4×)2016-10-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2016-07-01 · Nitrate: measured 12.00 MG/L vs limit 10.00 MG/L (1.2×)2016-04-01 · Nitrate: measured 15.00 MG/L vs limit 10.00 MG/L (1.5×)2016-01-01 · Nitrate: measured 14.00 MG/L vs limit 10.00 MG/L (1.4×)2015-10-01 · Nitrate: measured 57.00 MG/L vs limit 45.00 MG/L (1.3×)2015-07-01 · Nitrate: measured 51.00 MG/L vs limit 45.00 MG/L (1.1×)2015-04-01 · Nitrate: measured 63.00 MG/L vs limit 45.00 MG/L (1.4×)2015-01-01 · Nitrate: measured 67.99 MG/L vs limit 45.00 MG/L (1.5×)2014-10-01 · Nitrate: measured 59.85 MG/L vs limit 45.00 MG/L (1.3×)2014-10-01 · Nitrate-Nitrite: measured 13.30 MG/L vs limit 10.00 MG/L (1.3×)2014-07-01 · Nitrate: measured 56.00 MG/L vs limit 45.00 MG/L (1.2×)2014-07-01 · Nitrate-Nitrite: measured 12.40 MG/L vs limit 10.00 MG/L (1.2×)2014-04-01 · Nitrate: measured 57.00 MG/L vs limit 45.00 MG/L (1.3×)2014-04-01 · Nitrate-Nitrite: measured 12.60 MG/L vs limit 10.00 MG/L (1.3×)2014-03-01 · Nitrate-Nitrite: measured 13.10 MG/L vs limit 10.00 MG/L (1.3×)2013-10-01 · Nitrate-Nitrite: measured 13.60 MG/L vs limit 10.00 MG/L (1.4×)2013-08-01 · Nitrate-Nitrite: measured 11.30 MG/L vs limit 10.00 MG/L (1.1×)2013-07-01 · Nitrate-Nitrite: measured 14.70 MG/L vs limit 10.00 MG/L (1.5×)2013-05-01 · Nitrate-Nitrite: measured 11.10 MG/L vs limit 10.00 MG/L (1.1×)2013-03-01 · Nitrate-Nitrite: measured 18.00 MG/L vs limit 10.00 MG/L (1.8×)2013-02-01 · Nitrate-Nitrite: measured 17.10 MG/L vs limit 10.00 MG/L (1.7×)2013-01-01 · Nitrate-Nitrite: measured 18.00 MG/L vs limit 10.00 MG/L (1.8×)2011-05-01 · Nitrate-Nitrite: measured 10.44 MG/L vs limit 10.00 MG/L (1.0×)
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

3.1 ppb
0 ppb
0 ppb

Every violation on record

  1. 2025-01-01NitrateMCL, Single Samplemeasured 12.00 MG/L · limit 10.00 MG/LBack in compliance
  2. 2024-10-01NitrateMCL, Single Samplemeasured 16.00 MG/L · limit 10.00 MG/LBack in compliance
  3. 2024-07-01NitrateMCL, Single Samplemeasured 14.00 MG/L · limit 10.00 MG/LBack in compliance
  4. 2024-04-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LBack in compliance
  5. 2024-01-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LBack in compliance
  6. 2023-10-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  7. 2023-07-01NitrateMCL, Single Samplemeasured 12.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  8. 2023-04-01NitrateMCL, Single Samplemeasured 12.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  9. 2023-01-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  10. 2022-07-01NitrateMCL, Single Samplemeasured 18.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  11. 2022-04-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  12. 2022-01-01NitrateMCL, Single Samplemeasured 12.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  13. 2021-10-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  14. 2021-07-01NitrateMCL, Single Samplemeasured 14.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  15. 2021-04-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  16. 2021-01-01NitrateMCL, Single Samplemeasured 14.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  17. 2020-10-01NitrateMCL, Single Samplemeasured 14.00 MG/LPeriod ended · no return to compliance on file
  18. 2020-07-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  19. 2020-04-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  20. 2020-01-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  21. 2019-10-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  22. 2019-07-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  23. 2019-05-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  24. 2019-04-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  25. 2019-03-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
Show the other 40 entries
  1. 2019-02-01NitrateMCL, Single Samplemeasured 15.00 MG/LPeriod ended · no return to compliance on file
  2. 2019-01-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  3. 2018-09-01NitrateMCL, Single Samplemeasured 10.00 MG/LPeriod ended · no return to compliance on file
  4. 2018-08-01NitrateMCL, Single Samplemeasured 10.00 MG/LPeriod ended · no return to compliance on file
  5. 2018-07-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  6. 2018-04-01Nitrate-NitriteMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  7. 2018-01-01Nitrate-NitriteMCL, Single Samplemeasured 10.00 MG/L · limit 9.00 MG/LPeriod ended · no return to compliance on file
  8. 2017-10-01Nitrate-NitriteMCL, Single Samplemeasured 10.00 MG/L · limit 9.00 MG/LPeriod ended · no return to compliance on file
  9. 2017-07-01NitrateMCL, Single Samplemeasured 10.10 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  10. 2017-04-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  11. 2017-01-01NitrateMCL, Single Samplemeasured 14.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  12. 2016-10-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  13. 2016-07-01NitrateMCL, Single Samplemeasured 12.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  14. 2016-04-01NitrateMCL, Single Samplemeasured 15.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  15. 2016-01-01NitrateMCL, Single Samplemeasured 14.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  16. 2015-10-01NitrateMCL, Single Samplemeasured 57.00 MG/L · limit 45.00 MG/LBack in compliance
  17. 2015-07-01NitrateMCL, Single Samplemeasured 51.00 MG/L · limit 45.00 MG/LBack in compliance
  18. 2015-04-01NitrateMCL, Single Samplemeasured 63.00 MG/L · limit 45.00 MG/LBack in compliance
  19. 2015-01-01NitrateMCL, Single Samplemeasured 67.99 MG/L · limit 45.00 MG/LBack in compliance
  20. 2014-10-01NitrateMCL, Single Samplemeasured 59.85 MG/L · limit 45.00 MG/LBack in compliance
  21. 2014-10-01Nitrate-NitriteMCL, Single Samplemeasured 13.30 MG/L · limit 10.00 MG/LBack in compliance
  22. 2014-07-01NitrateMCL, Single Samplemeasured 56.00 MG/L · limit 45.00 MG/LBack in compliance
  23. 2014-07-01Nitrate-NitriteMCL, Single Samplemeasured 12.40 MG/L · limit 10.00 MG/LBack in compliance
  24. 2014-04-01NitrateMCL, Single Samplemeasured 57.00 MG/L · limit 45.00 MG/LBack in compliance
  25. 2014-04-01Nitrate-NitriteMCL, Single Samplemeasured 12.60 MG/L · limit 10.00 MG/LBack in compliance
  26. 2014-03-01Nitrate-NitriteMCL, Single Samplemeasured 13.10 MG/L · limit 10.00 MG/LBack in compliance
  27. 2013-10-01Nitrate-NitriteMCL, Averagemeasured 13.60 MG/L · limit 10.00 MG/LBack in compliance
  28. 2013-08-01Nitrate-NitriteMCL, Averagemeasured 11.30 MG/L · limit 10.00 MG/LBack in compliance
  29. 2013-07-01Nitrate-NitriteMCL, Averagemeasured 14.70 MG/L · limit 10.00 MG/LBack in compliance
  30. 2013-05-01Nitrate-NitriteMCL, Averagemeasured 11.10 MG/L · limit 10.00 MG/LBack in compliance
  31. 2013-03-01Nitrate-NitriteMCL, Averagemeasured 18.00 MG/L · limit 10.00 MG/LBack in compliance
  32. 2013-02-01Nitrate-NitriteMCL, Averagemeasured 17.10 MG/L · limit 10.00 MG/LBack in compliance
  33. 2013-01-01Nitrate-NitriteMCL, Averagemeasured 18.00 MG/L · limit 10.00 MG/LBack in compliance
  34. 2011-05-01Nitrate-NitriteMCL, Averagemeasured 10.44 MG/L · limit 10.00 MG/LBack in compliance
  35. 2009-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  36. 2009-04-14Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance
  37. 2008-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  38. 2005-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  39. 2005-02-15Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance
  40. 1993-07-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served120
Service connections45
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityStockton
EPA ZIP on file95209

Areas served

  • San Diego County

Reading this record

Quiet Oaks Mobile Home Park is a community water system that draws from groundwater and serves about 120 people in Stockton, 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.