Non-Transient Non-Community · PWSID CA2100582

Nicasio School

Serves 48 peopleGroundwater Under InfluenceOwner: PrivateNicasio, CaliforniaServes a school or daycare
Nothing open right now.

On record since 2006: 12 violations. 11 over the limit · 1 missed or late test. Most recent began 2021-10-01.

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

11Over the limit
0Treatment lapse
1Missed or late test
0Notice or report

More violations on record than 89% 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

20052006 · Missed or late test: 1201020152016 · Over the limit: 12018 · Over the limit: 32018 · Over the limit: 32018 · Over the limit: 32019 · Over the limit: 22019 · Over the limit: 22020 · Over the limit: 22020 · Over the limit: 220202021 · Over the limit: 32021 · Over the limit: 32021 · Over the limit: 32025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
92% over the limit · 118% missed or late test · 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×+Total Haloacetic Acids (HAA5)2021-10-01 · Total Haloacetic Acids (HAA5): measured 0.0650 MG/L vs limit 0.0600 MG/L (1.1×)2021-07-01 · Total Haloacetic Acids (HAA5): measured 0.0630 MG/L vs limit 0.0600 MG/L (1.1×)2021-04-01 · Total Haloacetic Acids (HAA5): measured 0.0630 MG/L vs limit 0.0600 MG/L (1.1×)2020-04-01 · Total Haloacetic Acids (HAA5): measured 0.0720 MG/L vs limit 0.0600 MG/L (1.2×)2020-01-01 · Total Haloacetic Acids (HAA5): measured 0.0740 MG/L vs limit 0.0600 MG/L (1.2×)2019-10-01 · Total Haloacetic Acids (HAA5): measured 0.0680 MG/L vs limit 0.0600 MG/L (1.1×)2019-07-01 · Total Haloacetic Acids (HAA5): measured 0.0650 MG/L vs limit 0.0600 MG/L (1.1×)2018-10-01 · Total Haloacetic Acids (HAA5): measured 0.0670 MG/L vs limit 0.0600 MG/L (1.1×)2018-07-01 · Total Haloacetic Acids (HAA5): measured 0.0750 MG/L vs limit 0.0600 MG/L (1.2×)2018-04-01 · Total Haloacetic Acids (HAA5): measured 0.0630 MG/L vs limit 0.0600 MG/L (1.1×)
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 3 results on file · action level 15 ppb

4 ppb
0 ppb
0 ppb

Every violation on record

  1. 2021-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0650 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  2. 2021-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0630 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  3. 2021-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0630 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  4. 2020-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0720 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  5. 2020-01-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0740 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  6. 2019-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0680 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  7. 2019-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0650 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  8. 2018-10-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0670 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  9. 2018-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0750 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  10. 2018-04-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 0.0630 MG/L · limit 0.0600 MG/LPeriod ended · no return to compliance on file
  11. 2016-07-01Total Haloacetic Acids (HAA5)MCL, Averagemeasured 69.90 UG/LBack in compliance
  12. 2006-11-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance

System details

Population served48
Service connections5
Water sourceGroundwater Under Influence
System typeNon-Transient Non-Community
OwnerPrivate
StatusActive
CityNicasio
EPA ZIP on file94946

Areas served

  • Marin County

Reading this record

Nicasio School is a non-transient non-community that draws from groundwater under influence and serves about 48 people in Nicasio, 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.