Community Water System · PWSID CA1500393

Rainbird Valley Mwc

Serves 238 peopleGroundwaterOwner: PrivateWeldon, California
Nothing open right now.

On record since 2000: 75 violations. 71 over the limit · 3 missed or late tests · 1 notice or report. 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.

71Over the limit
0Treatment lapse
3Missed or late test
1Notice 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

2000 · Missed or late test: 1200020052007 · Notice or report: 120102012 · Missed or late test: 120152016 · Over the limit: 82016 · Over the limit: 82016 · Over the limit: 82016 · Over the limit: 82016 · Over the limit: 82016 · Over the limit: 82016 · Over the limit: 82016 · Over the limit: 82017 · Over the limit: 62017 · Over the limit: 62017 · Over the limit: 62017 · Over the limit: 62017 · Over the limit: 62017 · Over the limit: 62017 · Missed or late test: 12018 · Over the limit: 82018 · Over the limit: 82018 · Over the limit: 82018 · Over the limit: 82018 · Over the limit: 82018 · Over the limit: 82018 · Over the limit: 82018 · 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: 82019 · Over the limit: 82020 · Over the limit: 62020 · Over the limit: 62020 · Over the limit: 62020 · Over the limit: 62020 · Over the limit: 62020 · Over the limit: 620202021 · Over the limit: 82021 · Over the limit: 82021 · Over the limit: 82021 · Over the limit: 82021 · Over the limit: 82021 · Over the limit: 82021 · Over the limit: 82021 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82024 · 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: 42025 · Over the limit: 42025 · Over the limit: 42025 · Over the limit: 42025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
95% over the limit · 714% missed or late test · 31% notice or report · 1

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×+Combined UraniumNitrate2020-01-01 · Combined Uranium: measured 37.00 PCI/L vs limit 20.00 PCI/L (1.9×)2019-10-01 · Nitrate: measured 26.00 MG/L vs limit 10.00 MG/L (2.6×)2019-10-01 · Combined Uranium: measured 37.00 PCI/L vs limit 20.00 PCI/L (1.9×)2019-07-01 · Nitrate: measured 24.00 MG/L vs limit 10.00 MG/L (2.4×)2018-10-01 · Combined Uranium: measured 24.00 PCI/L vs limit 20.00 PCI/L (1.2×)2018-10-01 · Nitrate: measured 25.00 MG/L vs limit 10.00 MG/L (2.5×)2018-07-01 · Combined Uranium: measured 22.00 PCI/L vs limit 20.00 PCI/L (1.1×)2018-07-01 · Nitrate: measured 23.00 MG/L vs limit 10.00 MG/L (2.3×)2018-04-01 · Combined Uranium: measured 50.00 PCI/L vs limit 20.00 PCI/L (2.5×)2018-04-01 · Nitrate: measured 21.00 MG/L vs limit 10.00 MG/L (2.1×)2018-01-01 · Combined Uranium: measured 56.00 PCI/L vs limit 20.00 PCI/L (2.8×)2018-01-01 · Nitrate: measured 19.00 MG/L vs limit 10.00 MG/L (1.9×)2017-10-01 · Combined Uranium: measured 48.00 PCI/L vs limit 20.00 PCI/L (2.4×)2017-10-01 · Nitrate: measured 18.00 MG/L vs limit 10.00 MG/L (1.8×)2017-07-01 · Combined Uranium: measured 44.00 PCI/L vs limit 20.00 PCI/L (2.2×)2017-07-01 · Nitrate: measured 19.00 MG/L vs limit 10.00 MG/L (1.9×)2017-04-01 · Combined Uranium: measured 46.00 PCI/L vs limit 20.00 PCI/L (2.3×)2017-01-01 · Combined Uranium: measured 39.00 PCI/L vs limit 20.00 PCI/L (1.9×)2016-10-01 · Combined Uranium: measured 40.00 PCI/L vs limit 20.00 PCI/L (2.0×)2016-10-01 · Nitrate: measured 20.00 MG/L vs limit 10.00 MG/L (2.0×)2016-07-01 · Combined Uranium: measured 49.00 PCI/L vs limit 20.00 PCI/L (2.5×)2016-07-01 · Nitrate: measured 16.00 MG/L vs limit 10.00 MG/L (1.6×)2016-04-01 · Nitrate: measured 17.00 MG/L vs limit 10.00 MG/L (1.7×)2016-04-01 · Combined Uranium: measured 35.00 PCI/L vs limit 20.00 PCI/L (1.8×)2016-01-01 · Combined Uranium: measured 38.00 PCI/L vs limit 20.00 PCI/L (1.9×)2016-01-01 · Nitrate: measured 17.00 MG/L vs limit 10.00 MG/L (1.7×)
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

2 ppb
1.3 ppb
0 ppb
0 ppb

Every violation on record

  1. 2025-04-01Combined UraniumMCL, Averagemeasured 34.00 PCI/LPeriod ended · no return to compliance on file
  2. 2025-04-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  3. 2025-01-01Combined UraniumMCL, Averagemeasured 34.00 PCI/LPeriod ended · no return to compliance on file
  4. 2025-01-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  5. 2024-10-01Combined UraniumMCL, Averagemeasured 35.00 PCI/LPeriod ended · no return to compliance on file
  6. 2024-10-01NitrateMCL, Single Samplemeasured 14.00 MG/LPeriod ended · no return to compliance on file
  7. 2024-07-01Combined UraniumMCL, Averagemeasured 35.00 PCI/LPeriod ended · no return to compliance on file
  8. 2024-07-01NitrateMCL, Single Samplemeasured 15.00 MG/LPeriod ended · no return to compliance on file
  9. 2024-04-01Combined UraniumMCL, Averagemeasured 37.00 PCI/LPeriod ended · no return to compliance on file
  10. 2024-01-01Combined UraniumMCL, Averagemeasured 48.00 PCI/LPeriod ended · no return to compliance on file
  11. 2024-01-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  12. 2023-10-01Combined UraniumMCL, Averagemeasured 52.00 PCI/LPeriod ended · no return to compliance on file
  13. 2023-10-01NitrateMCL, Single Samplemeasured 15.00 MG/LPeriod ended · no return to compliance on file
  14. 2023-07-01Combined UraniumMCL, Averagemeasured 61.00 PCI/LPeriod ended · no return to compliance on file
  15. 2023-07-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  16. 2023-04-01Combined UraniumMCL, Averagemeasured 66.00 PCI/LPeriod ended · no return to compliance on file
  17. 2023-04-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  18. 2023-01-01Combined UraniumMCL, Averagemeasured 86.00 PCI/LPeriod ended · no return to compliance on file
  19. 2023-01-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  20. 2022-10-01Combined UraniumMCL, Averagemeasured 102.00 PCI/LPeriod ended · no return to compliance on file
  21. 2022-10-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  22. 2022-07-01Combined UraniumMCL, Averagemeasured 111.00 PCI/LPeriod ended · no return to compliance on file
  23. 2022-07-01NitrateMCL, Single Samplemeasured 12.00 MG/LPeriod ended · no return to compliance on file
  24. 2022-04-01Combined UraniumMCL, Averagemeasured 112.00 PCI/LPeriod ended · no return to compliance on file
  25. 2022-04-01NitrateMCL, Single Samplemeasured 14.00 MG/LPeriod ended · no return to compliance on file
Show the other 50 entries
  1. 2022-01-01Combined UraniumMCL, Averagemeasured 96.00 PCI/LPeriod ended · no return to compliance on file
  2. 2022-01-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  3. 2021-10-01Combined UraniumMCL, Averagemeasured 83.00 PCI/LPeriod ended · no return to compliance on file
  4. 2021-10-01NitrateMCL, Single Samplemeasured 11.00 MG/LPeriod ended · no return to compliance on file
  5. 2021-07-01Combined UraniumMCL, Averagemeasured 68.00 PCI/LPeriod ended · no return to compliance on file
  6. 2021-07-01NitrateMCL, Single Samplemeasured 14.00 MG/LPeriod ended · no return to compliance on file
  7. 2021-04-01Combined UraniumMCL, Averagemeasured 63.00 PCI/LPeriod ended · no return to compliance on file
  8. 2021-04-01NitrateMCL, Single Samplemeasured 16.00 MG/LPeriod ended · no return to compliance on file
  9. 2021-01-01Combined UraniumMCL, Averagemeasured 34.00 PCI/LPeriod ended · no return to compliance on file
  10. 2021-01-01NitrateMCL, Single Samplemeasured 16.00 MG/LPeriod ended · no return to compliance on file
  11. 2020-10-01Combined UraniumMCL, Averagemeasured 35.00 PCI/LPeriod ended · no return to compliance on file
  12. 2020-10-01NitrateMCL, Single Samplemeasured 18.00 MG/LPeriod ended · no return to compliance on file
  13. 2020-07-01Combined UraniumMCL, Averagemeasured 29.00 PCI/LPeriod ended · no return to compliance on file
  14. 2020-07-01NitrateMCL, Single Samplemeasured 22.00 MG/LPeriod ended · no return to compliance on file
  15. 2020-01-01Combined UraniumMCL, Averagemeasured 37.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  16. 2020-01-01NitrateMCL, Single Samplemeasured 24.00 MG/LPeriod ended · no return to compliance on file
  17. 2019-10-01NitrateMCL, Single Samplemeasured 26.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  18. 2019-10-01Combined UraniumMCL, Averagemeasured 37.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  19. 2019-07-01NitrateMCL, Single Samplemeasured 24.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  20. 2019-07-01Combined UraniumMCL, Averagemeasured 37.00 PCI/LPeriod ended · no return to compliance on file
  21. 2019-04-01Combined UraniumMCL, Averagemeasured 28.00 PCI/LPeriod ended · no return to compliance on file
  22. 2019-04-01NitrateMCL, Single Samplemeasured 24.00 MG/LPeriod ended · no return to compliance on file
  23. 2019-01-01Combined UraniumMCL, Averagemeasured 27.00 PCI/LPeriod ended · no return to compliance on file
  24. 2019-01-01NitrateMCL, Single Samplemeasured 25.00 MG/LPeriod ended · no return to compliance on file
  25. 2018-10-01Combined UraniumMCL, Averagemeasured 24.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  26. 2018-10-01NitrateMCL, Single Samplemeasured 25.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  27. 2018-07-01Combined UraniumMCL, Averagemeasured 22.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  28. 2018-07-01NitrateMCL, Single Samplemeasured 23.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  29. 2018-04-01Combined UraniumMCL, Averagemeasured 50.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  30. 2018-04-01NitrateMCL, Single Samplemeasured 21.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  31. 2018-01-01Combined UraniumMCL, Averagemeasured 56.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  32. 2018-01-01NitrateMCL, Single Samplemeasured 19.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  33. 2017-10-01Combined UraniumMCL, Averagemeasured 48.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  34. 2017-10-01NitrateMCL, Single Samplemeasured 18.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  35. 2017-07-01Combined UraniumMCL, Averagemeasured 44.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  36. 2017-07-01NitrateMCL, Single Samplemeasured 19.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  37. 2017-04-01Combined UraniumMCL, Averagemeasured 46.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  38. 2017-01-01NitrateMonitoring, RegularBack in compliance
  39. 2017-01-01Combined UraniumMCL, Averagemeasured 39.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  40. 2016-10-01Combined UraniumMCL, Averagemeasured 40.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  41. 2016-10-01NitrateMCL, Single Samplemeasured 20.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  42. 2016-07-01Combined UraniumMCL, Averagemeasured 49.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  43. 2016-07-01NitrateMCL, Single Samplemeasured 16.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  44. 2016-04-01NitrateMCL, Single Samplemeasured 17.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  45. 2016-04-01Combined UraniumMCL, Averagemeasured 35.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  46. 2016-01-01Combined UraniumMCL, Averagemeasured 38.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  47. 2016-01-01NitrateMCL, Single Samplemeasured 17.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  48. 2012-01-01NitrateMonitoring, RegularBack in compliance
  49. 2007-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  50. 2000-01-01NitrateMonitoring, RegularBack in compliance

System details

Population served238
Service connections85
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityWeldon
EPA ZIP on file93283

Areas served

  • Kern County

Reading this record

Rainbird Valley Mwc is a community water system that draws from groundwater and serves about 238 people in Weldon, 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.