Community Water System · PWSID CA3700897

Guatay Mutual Benefit Corporation

Serves 100 peopleGroundwaterOwner: PrivateGuatay, 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 1993: 56 violations. 47 over the limit · 9 missed or late tests. Most recent began 2023-10-01.

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

47Over the limit
0Treatment lapse
9Missed or late test1 open
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

1993 · Missed or late test: 1199520002005201020152016 · Over the limit: 32016 · Over the limit: 32016 · Over the limit: 32016 · Missed or late test: 62016 · Missed or late test: 62016 · Missed or late test: 62016 · Missed or late test: 62016 · Missed or late test: 62016 · Missed or late test: 62017 · 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: 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: 82021 · Missed or late test: 12022 · Over the limit: 92022 · Over the limit: 92022 · Over the limit: 92022 · Over the limit: 92022 · Over the limit: 92022 · Over the limit: 92022 · Over the limit: 92022 · Over the limit: 92022 · Over the limit: 92023 · Over the limit: 72023 · Over the limit: 72023 · Over the limit: 72023 · Over the limit: 72023 · Over the limit: 72023 · Over the limit: 72023 · Over the limit: 72023 · Missed or late test: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
84% over the limit · 4716% missed or late test · 9

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 Uranium2023-10-01 · Combined Uranium: measured 71.00 PCI/L vs limit 20.00 PCI/L (3.5×)2023-10-01 · Combined Uranium: measured 68.00 PCI/L vs limit 20.00 PCI/L (3.4×)2023-07-01 · Combined Uranium: measured 130.00 PCI/L vs limit 20.00 PCI/L (6.5×)2023-07-01 · Combined Uranium: measured 76.00 PCI/L vs limit 20.00 PCI/L (3.8×)2023-01-01 · Combined Uranium: measured 55.00 PCI/L vs limit 20.00 PCI/L (2.8×)2023-01-01 · Combined Uranium: measured 110.00 PCI/L vs limit 20.00 PCI/L (5.5×)2023-01-01 · Combined Uranium: measured 41.00 PCI/L vs limit 20.00 PCI/L (2.0×)2022-10-01 · Combined Uranium: measured 80.00 PCI/L vs limit 20.00 PCI/L (4.0×)2022-10-01 · Combined Uranium: measured 100.00 PCI/L vs limit 20.00 PCI/L (5.0×)2022-10-01 · Combined Uranium: measured 64.00 PCI/L vs limit 20.00 PCI/L (3.2×)2022-07-01 · Combined Uranium: measured 49.00 PCI/L vs limit 20.00 PCI/L (2.5×)2022-07-01 · Combined Uranium: measured 110.00 PCI/L vs limit 20.00 PCI/L (5.5×)2022-07-01 · Combined Uranium: measured 68.00 PCI/L vs limit 20.00 PCI/L (3.4×)2022-01-01 · Combined Uranium: measured 130.00 PCI/L vs limit 20.00 PCI/L (6.5×)2022-01-01 · Combined Uranium: measured 100.00 PCI/L vs limit 20.00 PCI/L (5.0×)2022-01-01 · Combined Uranium: measured 40.00 PCI/L vs limit 20.00 PCI/L (2.0×)2021-10-01 · Combined Uranium: measured 42.00 PCI/L vs limit 20.00 PCI/L (2.1×)2021-10-01 · Combined Uranium: measured 58.20 PCI/L vs limit 20.00 PCI/L (2.9×)2021-10-01 · Combined Uranium: measured 44.20 PCI/L vs limit 20.00 PCI/L (2.2×)2021-04-01 · Combined Uranium: measured 40.60 PCI/L vs limit 20.00 PCI/L (2.0×)2021-04-01 · Combined Uranium: measured 116.00 PCI/L vs limit 20.00 PCI/L (5.8×)2021-04-01 · Combined Uranium: measured 128.00 PCI/L vs limit 20.00 PCI/L (6.4×)2021-01-01 · Combined Uranium: measured 37.70 PCI/L vs limit 20.00 PCI/L (1.9×)2021-01-01 · Combined Uranium: measured 108.73 PCI/L vs limit 20.00 PCI/L (5.4×)2020-10-01 · Combined Uranium: measured 32.70 PCI/L vs limit 20.00 PCI/L (1.6×)2020-10-01 · Combined Uranium: measured 116.50 PCI/L vs limit 20.00 PCI/L (5.8×)2020-07-01 · Combined Uranium: measured 30.43 PCI/L vs limit 20.00 PCI/L (1.5×)2020-04-01 · Combined Uranium: measured 90.10 PCI/L vs limit 20.00 PCI/L (4.5×)2019-10-01 · Combined Uranium: measured 53.00 PCI/L vs limit 20.00 PCI/L (2.6×)2019-10-01 · Combined Uranium: measured 69.40 PCI/L vs limit 20.00 PCI/L (3.5×)2018-04-01 · Combined Uranium: measured 49.65 PCI/L vs limit 30.00 PCI/L (1.7×)2018-01-01 · Combined Uranium: measured 41.03 PCI/L vs limit 30.00 PCI/L (1.4×)2017-10-01 · Combined Uranium: measured 54.30 PCI/L vs limit 30.00 PCI/L (1.8×)2017-07-01 · Combined Uranium: measured 49.18 PCI/L vs limit 30.00 PCI/L (1.6×)2017-04-01 · Combined Uranium: measured 24.78 PCI/L vs limit 20.00 PCI/L (1.2×)2017-01-01 · Combined Uranium: measured 24.93 PCI/L vs limit 20.00 PCI/L (1.2×)2016-10-01 · Combined Uranium: measured 22.50 PCI/L vs limit 20.00 PCI/L (1.1×)2016-07-01 · Combined Uranium: measured 21.60 PCI/L vs limit 20.00 PCI/L (1.1×)2016-04-01 · Combined Uranium: measured 24.00 PCI/L vs limit 20.00 PCI/L (1.2×)
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

35 ppb
0 ppb

Open now (1)

  1. 2021-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/ROpen

Every violation on record

  1. 2023-10-01Combined Uranium ×2MCL, Single Samplemeasured 71.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  2. 2023-07-01Combined Uranium ×2MCL, Single Samplemeasured 130.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  3. 2023-01-01NitrateMonitoring, RegularPeriod ended · no return to compliance on file
  4. 2023-01-01Combined Uranium ×3MCL, Single Samplemeasured 55.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  5. 2022-10-01Combined Uranium ×3MCL, Single Samplemeasured 80.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  6. 2022-07-01Combined Uranium ×3MCL, Single Samplemeasured 49.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  7. 2022-01-01Combined Uranium ×2MCL, Single Samplemeasured 130.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  8. 2022-01-01Combined UraniumMCL, Averagemeasured 40.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  9. 2021-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/ROpen
  10. 2021-10-01Combined Uranium ×2MCL, Single Samplemeasured 42.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  11. 2021-10-01Combined UraniumMCL, Averagemeasured 44.20 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  12. 2021-04-01Combined Uranium ×2MCL, Single Samplemeasured 40.60 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  13. 2021-04-01Combined UraniumMCL, Averagemeasured 128.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  14. 2021-01-01Combined Uranium ×2MCL, Averagemeasured 37.70 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  15. 2020-10-01Combined Uranium ×2MCL, Averagemeasured 32.70 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  16. 2020-07-01Combined UraniumMCL, Averagemeasured 30.43 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  17. 2020-04-01Combined UraniumMCL, Averagemeasured 90.10 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  18. 2019-10-01Combined Uranium ×2MCL, Averagemeasured 53.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  19. 2019-04-01Combined Uranium ×3MCL, Averagemeasured 26.80 PCI/LPeriod ended · no return to compliance on file
  20. 2019-01-01Combined Uranium ×2MCL, Averagemeasured 93.60 PCI/LPeriod ended · no return to compliance on file
  21. 2018-10-01Combined Uranium ×2MCL, Averagemeasured 83.60 PCI/LPeriod ended · no return to compliance on file
  22. 2018-07-01Combined UraniumMCL, Averagemeasured 57.90 PCI/LPeriod ended · no return to compliance on file
  23. 2018-04-01Combined UraniumMCL, Averagemeasured 49.65 PCI/L · limit 30.00 PCI/LPeriod ended · no return to compliance on file
  24. 2018-01-01Combined UraniumMCL, Averagemeasured 41.03 PCI/L · limit 30.00 PCI/LPeriod ended · no return to compliance on file
  25. 2017-10-01Combined UraniumMCL, Averagemeasured 54.30 PCI/L · limit 30.00 PCI/LPeriod ended · no return to compliance on file
Show the other 13 entries
  1. 2017-07-01Combined UraniumMCL, Averagemeasured 49.18 PCI/L · limit 30.00 PCI/LPeriod ended · no return to compliance on file
  2. 2017-04-01Combined UraniumMCL, Averagemeasured 24.78 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  3. 2017-01-01Combined UraniumMCL, Averagemeasured 24.93 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  4. 2016-10-01Combined UraniumMCL, Averagemeasured 22.50 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  5. 2016-07-01Combined UraniumMCL, Averagemeasured 21.60 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  6. 2016-04-01Combined UraniumMCL, Averagemeasured 24.00 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  7. 2016-01-01BenzeneMonitoring, RegularBack in compliance
  8. 2016-01-01Methyl Tert-Butyl EtherMonitoring, RegularPeriod ended · no return to compliance on file
  9. 2016-01-01TdsMonitoring, RegularPeriod ended · no return to compliance on file
  10. 2016-01-01OdorMonitoring, RegularPeriod ended · no return to compliance on file
  11. 2016-01-01ManganeseMonitoring, RegularPeriod ended · no return to compliance on file
  12. 2016-01-01IronMonitoring, RegularPeriod ended · no return to compliance on file
  13. 1993-07-01Lead and Copper RuleInitial Tap Sampling for Pb and CuBack in compliance

System details

Population served100
Service connections32
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityGuatay
EPA ZIP on file91931

Areas served

  • San Diego County

Reading this record

Guatay Mutual Benefit Corporation is a community water system that draws from groundwater and serves about 100 people in Guatay, 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.