Community Water System · PWSID CA3700918

Rancho Santa Teresa Mw Co.

Serves 102 peopleGroundwaterOwner: PrivateRamona, California
Nothing open right now.

On record since 1993: 83 violations. 28 over the limit · 54 missed or late tests · 1 notice or report. Most recent began 2024-10-01.

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

28Over the limit
0Treatment lapse
54Missed 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

1993 · Missed or late test: 119952000200520102014 · Over the limit: 32015 · Over the limit: 42015 · Over the limit: 420152016 · Over the limit: 42016 · Over the limit: 42016 · Missed or late test: 272016 · Missed or late test: 272016 · Missed or late test: 272016 · Missed or late test: 272016 · Missed or late test: 272016 · Missed or late test: 272016 · Missed or late test: 272016 · Missed or late test: 272016 · Missed or late test: 272017 · Over the limit: 42017 · Over the limit: 42017 · Missed or late test: 12018 · Over the limit: 62018 · Over the limit: 62018 · Missed or late test: 32019 · Over the limit: 42019 · Over the limit: 42019 · Missed or late test: 32020 · Missed or late test: 52020 · Missed or late test: 520202021 · Missed or late test: 82021 · Missed or late test: 82021 · Missed or late test: 82022 · Missed or late test: 52022 · Missed or late test: 52023 · Over the limit: 22023 · Missed or late test: 12023 · Notice or report: 12024 · Over the limit: 12025
One square ≈ 3 violations (rounded up), by the year they began. Empty columns are years with nothing on EPA's record.
34% over the limit · 2865% missed or late test · 541% 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×+NitrateCombined Uranium2024-10-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2023-10-01 · Nitrate: measured 13.00 MG/L vs limit 10.00 MG/L (1.3×)2023-07-01 · Nitrate: measured 11.00 MG/L vs limit 10.00 MG/L (1.1×)2017-04-01 · Combined Uranium: measured 67.33 PCI/L vs limit 20.00 PCI/L (3.4×)2017-01-01 · Combined Uranium: measured 51.34 PCI/L vs limit 20.00 PCI/L (2.6×)2016-10-01 · Combined Uranium: measured 46.97 PCI/L vs limit 20.00 PCI/L (2.3×)2016-07-01 · Combined Uranium: measured 46.83 PCI/L vs limit 20.00 PCI/L (2.3×)2016-04-01 · Combined Uranium: measured 45.52 PCI/L vs limit 20.00 PCI/L (2.3×)2016-01-01 · Combined Uranium: measured 41.93 PCI/L vs limit 20.00 PCI/L (2.1×)2015-10-01 · Combined Uranium: measured 37.55 PCI/L vs limit 20.00 PCI/L (1.9×)2015-07-01 · Combined Uranium: measured 35.22 PCI/L vs limit 20.00 PCI/L (1.8×)2015-04-01 · Combined Uranium: measured 39.17 PCI/L vs limit 20.00 PCI/L (2.0×)2015-01-01 · Combined Uranium: measured 43.50 PCI/L vs limit 20.00 PCI/L (2.2×)2014-10-01 · Combined Uranium: measured 50.10 PCI/L vs limit 20.00 PCI/L (2.5×)2014-07-01 · Combined Uranium: measured 57.25 PCI/L vs limit 20.00 PCI/L (2.9×)2014-04-01 · Combined Uranium: measured 53.00 PCI/L vs limit 20.00 PCI/L (2.6×)
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 10 results on file · action level 15 ppb

16.5 ppb
10.4 ppb
4.5 ppb
3.5 ppb
2.9 ppb
1.8 ppb
0 ppb
0 ppb
0 ppb
0 ppb

Every violation on record

  1. 2024-10-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  2. 2023-10-01ManganeseMonitoring, RegularBack in compliance
  3. 2023-10-01NitrateMCL, Single Samplemeasured 13.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  4. 2023-08-29Public NoticePN Violation for NPDWR ViolationBack in compliance
  5. 2023-07-01NitrateMCL, Single Samplemeasured 11.00 MG/L · limit 10.00 MG/LPeriod ended · no return to compliance on file
  6. 2022-07-01Revised Total Coliform RuleMONBack in compliance
  7. 2022-04-01NitrateMonitoring, RegularBack in compliance
  8. 2022-04-01Revised Total Coliform RuleMONBack in compliance
  9. 2022-02-01Revised Total Coliform RuleMONBack in compliance
  10. 2022-01-01Revised Total Coliform RuleMONBack in compliance
  11. 2021-10-01Revised Total Coliform RuleMONBack in compliance
  12. 2021-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  13. 2021-07-01NitrateMonitoring, RegularBack in compliance
  14. 2021-07-01Revised Total Coliform RuleMONBack in compliance
  15. 2021-04-01NitrateMonitoring, RegularBack in compliance
  16. 2021-04-01Revised Total Coliform RuleMONBack in compliance
  17. 2021-01-01Revised Total Coliform RuleMONBack in compliance
  18. 2021-01-01NitrateMonitoring, RegularBack in compliance
  19. 2020-10-01Revised Total Coliform RuleMONBack in compliance
  20. 2020-08-01Revised Total Coliform RuleMONBack in compliance
  21. 2020-07-01Revised Total Coliform RuleMONBack in compliance
  22. 2020-06-01Revised Total Coliform RuleMONBack in compliance
  23. 2020-04-01Revised Total Coliform RuleMONBack in compliance
  24. 2019-06-01Revised Total Coliform RuleMONBack in compliance
  25. 2019-04-01NitrateMonitoring, RegularBack in compliance
Show the other 55 entries
  1. 2019-04-01Combined Uranium ×2MCL, Averagemeasured 59.00 PCI/LBack in compliance
  2. 2019-01-01NitrateMonitoring, RegularBack in compliance
  3. 2019-01-01Combined Uranium ×2MCL, Averagemeasured 92.00 PCI/LBack in compliance
  4. 2018-10-01Combined Uranium ×2MCL, Averagemeasured 36.00 PCI/LBack in compliance
  5. 2018-10-01Gross Alpha Particle ActivityMCL, Averagemeasured 82.00 PCI/LBack in compliance
  6. 2018-07-01NitrateMCL, Single Samplemeasured 10.50 MG/LBack in compliance
  7. 2018-04-01NitrateMonitoring, RegularBack in compliance
  8. 2018-04-01Combined UraniumMCL, Averagemeasured 20.33 PCI/LBack in compliance
  9. 2018-01-01NitrateMonitoring, RegularBack in compliance
  10. 2018-01-011,2,3-TrichloropropaneMonitoring, RegularBack in compliance
  11. 2018-01-01Combined UraniumMCL, Averagemeasured 20.50 PCI/LBack in compliance
  12. 2017-10-01Combined UraniumMCL, Averagemeasured 20.67 PCI/LBack in compliance
  13. 2017-07-01NitrateMonitoring, RegularBack in compliance
  14. 2017-07-01Combined UraniumMCL, Averagemeasured 20.77 PCI/LBack in compliance
  15. 2017-04-01Combined UraniumMCL, Averagemeasured 67.33 PCI/L · limit 20.00 PCI/LBack in compliance
  16. 2017-01-01Combined UraniumMCL, Averagemeasured 51.34 PCI/L · limit 20.00 PCI/LBack in compliance
  17. 2016-10-01Combined UraniumMCL, Averagemeasured 46.97 PCI/L · limit 20.00 PCI/LBack in compliance
  18. 2016-07-01Combined UraniumMCL, Averagemeasured 46.83 PCI/L · limit 20.00 PCI/LBack in compliance
  19. 2016-04-01Combined UraniumMCL, Averagemeasured 45.52 PCI/L · limit 20.00 PCI/LBack in compliance
  20. 2016-01-01StyreneMonitoring, RegularBack in compliance
  21. 2016-01-01EthylbenzeneMonitoring, RegularBack in compliance
  22. 2016-01-01TolueneMonitoring, RegularBack in compliance
  23. 2016-01-01BenzeneMonitoring, RegularBack in compliance
  24. 2016-01-01ChlorobenzeneMonitoring, RegularBack in compliance
  25. 2016-01-011,1,2,2-TetrachloroethaneMonitoring, RegularBack in compliance
  26. 2016-01-01TetrachloroethyleneMonitoring, RegularBack in compliance
  27. 2016-01-011,1,2-TrichloroethaneMonitoring, RegularBack in compliance
  28. 2016-01-01TrichloroethyleneMonitoring, RegularBack in compliance
  29. 2016-01-011,2-DichloropropaneMonitoring, RegularBack in compliance
  30. 2016-01-01Carbon tetrachlorideMonitoring, RegularBack in compliance
  31. 2016-01-011,1,1-TrichloroethaneMonitoring, RegularBack in compliance
  32. 2016-01-011,2-DichloroethaneMonitoring, RegularBack in compliance
  33. 2016-01-01trans-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  34. 2016-01-011,1-DichloroethaneMonitoring, RegularBack in compliance
  35. 2016-01-011,1-DichloroethyleneMonitoring, RegularBack in compliance
  36. 2016-01-01Vinyl chlorideMonitoring, RegularBack in compliance
  37. 2016-01-01p-DichlorobenzeneMonitoring, RegularBack in compliance
  38. 2016-01-01o-DichlorobenzeneMonitoring, RegularBack in compliance
  39. 2016-01-01DichloromethaneMonitoring, RegularBack in compliance
  40. 2016-01-01Xylenes, TotalMonitoring, RegularBack in compliance
  41. 2016-01-01TrichlorotrifluoroethaneMonitoring, RegularBack in compliance
  42. 2016-01-011, 3-DichloropropeneMonitoring, RegularBack in compliance
  43. 2016-01-01cis-1,2-DichloroethyleneMonitoring, RegularBack in compliance
  44. 2016-01-011,2,4-TrichlorobenzeneMonitoring, RegularBack in compliance
  45. 2016-01-01Methyl Tert-Butyl EtherMonitoring, RegularBack in compliance
  46. 2016-01-01TrichlorofluoromethaneMonitoring, RegularBack in compliance
  47. 2016-01-01Combined UraniumMCL, Averagemeasured 41.93 PCI/L · limit 20.00 PCI/LBack in compliance
  48. 2015-10-01Combined UraniumMCL, Averagemeasured 37.55 PCI/L · limit 20.00 PCI/LBack in compliance
  49. 2015-07-01Combined UraniumMCL, Averagemeasured 35.22 PCI/L · limit 20.00 PCI/LBack in compliance
  50. 2015-04-01Combined UraniumMCL, Averagemeasured 39.17 PCI/L · limit 20.00 PCI/LBack in compliance
  51. 2015-01-01Combined UraniumMCL, Averagemeasured 43.50 PCI/L · limit 20.00 PCI/LBack in compliance
  52. 2014-10-01Combined UraniumMCL, Averagemeasured 50.10 PCI/L · limit 20.00 PCI/LBack in compliance
  53. 2014-07-01Combined UraniumMCL, Averagemeasured 57.25 PCI/L · limit 20.00 PCI/LBack in compliance
  54. 2014-04-01Combined UraniumMCL, Averagemeasured 53.00 PCI/L · limit 20.00 PCI/LBack in compliance
  55. 1993-07-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served102
Service connections38
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityRamona
EPA ZIP on file92065

Areas served

  • San Diego County

Reading this record

Rancho Santa Teresa Mw Co. is a community water system that draws from groundwater and serves about 102 people in Ramona, 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.