Community Water System · PWSID CA3610031

Muscoy Mwc No. 1

Serves 13,000 peopleGroundwaterOwner: PrivateSan Bernardino, California
Nothing open right now.

On record since 2008: 20 violations. 1 over the limit · 19 missed or late tests. Most recent began 2024-04-01.

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

1Over the limit
0Treatment lapse
19Missed or late test
0Notice or report

More violations on record than 93% 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

20052008 · Missed or late test: 12009 · Over the limit: 120102012 · Missed or late test: 120152020 · Missed or late test: 120202023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122023 · Missed or late test: 122024 · Missed or late test: 42024 · Missed or late test: 42024 · Missed or late test: 42024 · Missed or late test: 42025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
5% over the limit · 195% missed or late test · 19

Across California, 52% of violations are missed or late tests and 29% are water over a limit.

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

0 ppb
0 ppb
0 ppb

Every violation on record

  1. 2024-04-01Revised Total Coliform RuleMONBack in compliance
  2. 2024-03-01Revised Total Coliform RuleMONBack in compliance
  3. 2024-02-01Revised Total Coliform RuleMONBack in compliance
  4. 2024-01-01Revised Total Coliform RuleMONBack in compliance
  5. 2023-12-01Revised Total Coliform RuleMONBack in compliance
  6. 2023-11-01Revised Total Coliform RuleMONBack in compliance
  7. 2023-10-01Revised Total Coliform RuleMONBack in compliance
  8. 2023-09-01Revised Total Coliform RuleMONBack in compliance
  9. 2023-08-01Revised Total Coliform RuleMONBack in compliance
  10. 2023-07-01Revised Total Coliform RuleMONBack in compliance
  11. 2023-06-01Revised Total Coliform RuleMONBack in compliance
  12. 2023-05-01Revised Total Coliform RuleMONBack in compliance
  13. 2023-04-01Revised Total Coliform RuleMONBack in compliance
  14. 2023-03-01Revised Total Coliform RuleMONBack in compliance
  15. 2023-02-01Revised Total Coliform RuleMONBack in compliance
  16. 2023-01-01Revised Total Coliform RuleMONBack in compliance
  17. 2020-08-01Revised Total Coliform RuleMonitoring, RegularBack in compliance
  18. 2012-01-01Coliform (TCR)Monitoring, Routine Minor (TCR)Back in compliance
  19. 2009-11-01Coliform (TCR)MCL, Monthly (TCR)Back in compliance
  20. 2008-05-01Coliform (TCR)Monitoring, Repeat Minor (TCR)Back in compliance

System details

Population served13,000
Service connections1,459
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CitySan Bernardino
EPA ZIP on file92407

Areas served

  • San Bernardino County

Reading this record

Muscoy Mwc No. 1 is a community water system that draws from groundwater and serves about 13,000 people in San Bernardino, 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.