Community Water System · PWSID CA3700291

Ocotillo Oasis, LLC

Serves 96 peopleGroundwaterOwner: PrivateSan Marcos, California
Nothing open that measures the water, but 1 open testing or paperwork violation.

A missed test is not evidence of bad water. It also is not evidence of good water: for that period nobody checked.

On record since 2013: 86 violations. 26 over the limit · 60 missed or late tests. Most recent began 2024-08-01.

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

26Over the limit
0Treatment lapse
60Missed or late test1 open
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

200520102013 · Over the limit: 32014 · Over the limit: 42014 · Over the limit: 42015 · Over the limit: 42015 · Over the limit: 420152016 · Over the limit: 42016 · Over the limit: 42017 · Over the limit: 42017 · Over the limit: 42019 · Over the limit: 120202021 · Over the limit: 42021 · Over the limit: 42021 · Missed or late test: 22022 · Missed or late test: 152022 · Missed or late test: 152022 · Missed or late test: 152022 · Missed or late test: 152022 · Missed or late test: 152023 · Over the limit: 22023 · Missed or late test: 302023 · Missed or late test: 302023 · Missed or late test: 302023 · Missed or late test: 302023 · Missed or late test: 302023 · Missed or late test: 302023 · Missed or late test: 302023 · Missed or late test: 302023 · Missed or late test: 302023 · Missed or late test: 302024 · Missed or late test: 132024 · Missed or late test: 132024 · Missed or late test: 132024 · Missed or late test: 132024 · Missed or late test: 132025
One square ≈ 3 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
30% over the limit · 2670% missed or late test · 60

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×+FluorideNitrate2023-04-01 · Fluoride: measured 3.00 MG/L vs limit 2.00 MG/L (1.5×)2023-01-01 · Fluoride: measured 2.31 MG/L vs limit 2.00 MG/L (1.2×)2021-10-01 · Fluoride: measured 2.23 MG/L vs limit 2.00 MG/L (1.1×)2021-07-01 · Fluoride: measured 2.51 MG/L vs limit 2.00 MG/L (1.3×)2021-04-01 · Fluoride: measured 2.25 MG/L vs limit 2.00 MG/L (1.1×)2021-01-01 · Fluoride: measured 2.43 MG/L vs limit 2.00 MG/L (1.2×)2019-09-03 · Nitrate: measured 27.00 MG/L vs limit 10.00 MG/L (2.7×)2017-10-01 · Fluoride: measured 4.85 MG/L vs limit 2.00 MG/L (2.4×)2017-07-01 · Fluoride: measured 4.76 MG/L vs limit 2.00 MG/L (2.4×)2017-04-01 · Fluoride: measured 4.56 MG/L vs limit 2.00 MG/L (2.3×)2017-01-01 · Fluoride: measured 4.73 MG/L vs limit 2.00 MG/L (2.4×)2016-10-01 · Fluoride: measured 4.82 MG/L vs limit 2.00 MG/L (2.4×)2016-07-01 · Fluoride: measured 4.60 MG/L vs limit 2.00 MG/L (2.3×)2016-04-01 · Fluoride: measured 4.66 MG/L vs limit 2.00 MG/L (2.3×)2016-01-01 · Fluoride: measured 5.21 MG/L vs limit 2.00 MG/L (2.6×)2015-10-01 · Fluoride: measured 4.63 MG/L vs limit 2.00 MG/L (2.3×)2015-07-01 · Fluoride: measured 5.11 MG/L vs limit 2.00 MG/L (2.6×)2015-04-01 · Fluoride: measured 4.75 MG/L vs limit 2.00 MG/L (2.4×)2015-01-01 · Fluoride: measured 4.16 MG/L vs limit 2.00 MG/L (2.1×)2014-10-01 · Fluoride: measured 4.97 MG/L vs limit 2.00 MG/L (2.5×)2014-07-01 · Fluoride: measured 4.40 MG/L vs limit 2.00 MG/L (2.2×)2014-04-01 · Fluoride: measured 4.27 MG/L vs limit 2.00 MG/L (2.1×)2014-03-01 · Fluoride: measured 4.36 MG/L vs limit 2.00 MG/L (2.2×)2013-11-01 · Fluoride: measured 4.45 MG/L vs limit 2.00 MG/L (2.2×)2013-09-01 · Fluoride: measured 4.59 MG/L vs limit 2.00 MG/L (2.3×)2013-06-01 · Fluoride: measured 4.75 MG/L vs limit 2.00 MG/L (2.4×)
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 2 results on file · action level 15 ppb

0 ppb
0 ppb

Open now (1)

  1. 2023-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/ROpen

Every violation on record

  1. 2024-08-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  2. 2024-07-01FluorideMonitoring, RegularPeriod ended · no return to compliance on file
  3. 2024-07-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  4. 2024-04-01Fluoride ×3Monitoring, RegularPeriod ended · no return to compliance on file
  5. 2024-02-01FluorideMonitoring, RegularPeriod ended · no return to compliance on file
  6. 2024-02-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  7. 2024-01-01Fluoride ×4Monitoring, RegularPeriod ended · no return to compliance on file
  8. 2024-01-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  9. 2023-12-01FluorideMonitoring, RegularPeriod ended · no return to compliance on file
  10. 2023-12-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  11. 2023-11-01FluorideMonitoring, RegularPeriod ended · no return to compliance on file
  12. 2023-11-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  13. 2023-10-31FluorideMonitoring, RegularPeriod ended · no return to compliance on file
  14. 2023-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/ROpen
  15. 2023-10-01Fluoride ×3Monitoring, RegularPeriod ended · no return to compliance on file
  16. 2023-10-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  17. 2023-09-01FluorideMonitoring, RegularPeriod ended · no return to compliance on file
  18. 2023-09-01Nitrate ×2Monitoring, RegularPeriod ended · no return to compliance on file
  19. 2023-08-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  20. 2023-07-01Fluoride ×4Monitoring, RegularPeriod ended · no return to compliance on file
  21. 2023-07-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  22. 2023-04-01Fluoride ×2Monitoring, RegularPeriod ended · no return to compliance on file
  23. 2023-04-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  24. 2023-04-01FluorideMCL, Averagemeasured 3.00 MG/L · limit 2.00 MG/LPeriod ended · no return to compliance on file
  25. 2023-01-01Fluoride ×4Monitoring, RegularPeriod ended · no return to compliance on file
Show the other 35 entries
  1. 2023-01-01Nitrate ×4Monitoring, RegularPeriod ended · no return to compliance on file
  2. 2023-01-01FluorideMCL, Averagemeasured 2.31 MG/L · limit 2.00 MG/LPeriod ended · no return to compliance on file
  3. 2022-12-01FluorideMonitoring, RegularPeriod ended · no return to compliance on file
  4. 2022-12-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  5. 2022-10-01Fluoride ×3Monitoring, RegularPeriod ended · no return to compliance on file
  6. 2022-10-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  7. 2022-07-01Fluoride ×3Monitoring, RegularPeriod ended · no return to compliance on file
  8. 2022-04-01Fluoride ×3Monitoring, RegularPeriod ended · no return to compliance on file
  9. 2022-01-01Fluoride ×3Monitoring, RegularPeriod ended · no return to compliance on file
  10. 2021-11-01FluorideMonitoring, RegularPeriod ended · no return to compliance on file
  11. 2021-11-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  12. 2021-10-01FluorideMCL, Averagemeasured 2.23 MG/L · limit 2.00 MG/LPeriod ended · no return to compliance on file
  13. 2021-07-01FluorideMCL, Averagemeasured 2.51 MG/L · limit 2.00 MG/LPeriod ended · no return to compliance on file
  14. 2021-04-01FluorideMCL, Averagemeasured 2.25 MG/L · limit 2.00 MG/LPeriod ended · no return to compliance on file
  15. 2021-01-01FluorideMCL, Averagemeasured 2.43 MG/L · limit 2.00 MG/LPeriod ended · no return to compliance on file
  16. 2019-09-03NitrateMCL, Single Samplemeasured 27.00 MG/L · limit 10.00 MG/LBack in compliance
  17. 2017-10-01FluorideMCL, Averagemeasured 4.85 MG/L · limit 2.00 MG/LBack in compliance
  18. 2017-07-01FluorideMCL, Averagemeasured 4.76 MG/L · limit 2.00 MG/LBack in compliance
  19. 2017-04-01FluorideMCL, Averagemeasured 4.56 MG/L · limit 2.00 MG/LBack in compliance
  20. 2017-01-01FluorideMCL, Averagemeasured 4.73 MG/L · limit 2.00 MG/LBack in compliance
  21. 2016-10-01FluorideMCL, Averagemeasured 4.82 MG/L · limit 2.00 MG/LBack in compliance
  22. 2016-07-01FluorideMCL, Averagemeasured 4.60 MG/L · limit 2.00 MG/LBack in compliance
  23. 2016-04-01FluorideMCL, Averagemeasured 4.66 MG/L · limit 2.00 MG/LBack in compliance
  24. 2016-01-01FluorideMCL, Averagemeasured 5.21 MG/L · limit 2.00 MG/LBack in compliance
  25. 2015-10-01FluorideMCL, Averagemeasured 4.63 MG/L · limit 2.00 MG/LBack in compliance
  26. 2015-07-01FluorideMCL, Averagemeasured 5.11 MG/L · limit 2.00 MG/LBack in compliance
  27. 2015-04-01FluorideMCL, Averagemeasured 4.75 MG/L · limit 2.00 MG/LBack in compliance
  28. 2015-01-01FluorideMCL, Averagemeasured 4.16 MG/L · limit 2.00 MG/LBack in compliance
  29. 2014-10-01FluorideMCL, Averagemeasured 4.97 MG/L · limit 2.00 MG/LBack in compliance
  30. 2014-07-01FluorideMCL, Averagemeasured 4.40 MG/L · limit 2.00 MG/LBack in compliance
  31. 2014-04-01FluorideMCL, Averagemeasured 4.27 MG/L · limit 2.00 MG/LBack in compliance
  32. 2014-03-01FluorideMCL, Averagemeasured 4.36 MG/L · limit 2.00 MG/LBack in compliance
  33. 2013-11-01FluorideMCL, Averagemeasured 4.45 MG/L · limit 2.00 MG/LBack in compliance
  34. 2013-09-01FluorideMCL, Averagemeasured 4.59 MG/L · limit 2.00 MG/LBack in compliance
  35. 2013-06-01FluorideMCL, Averagemeasured 4.75 MG/L · limit 2.00 MG/LBack in compliance

System details

Population served96
Service connections55
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CitySan Marcos
EPA ZIP on file92078

Areas served

  • San Diego County

Reading this record

Ocotillo Oasis, LLC is a community water system that draws from groundwater and serves about 96 people in San Marcos, 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.