Non-Transient Non-Community · PWSID NY5907720

West Patent Elementary School

Serves 400 peopleGroundwaterOwner: Local GovernmentArmonk, New YorkServes a school or daycare
Nothing open right now.

On record since 2007: 33 violations. 30 over the limit · 1 treatment lapse · 2 missed or late tests. Most recent began 2025-07-01.

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

30Over the limit
1Treatment lapse
2Missed or late test
0Notice or report

More violations on record than 88% of active water systems in New York. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

20052007 · Missed or late test: 1201020152019 · Treatment lapse: 12019 · Missed or late test: 120202022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82022 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82023 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82024 · Over the limit: 82025 · Over the limit: 62025 · Over the limit: 62025 · Over the limit: 62025 · Over the limit: 62025 · Over the limit: 62025 · Over the limit: 62025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
91% over the limit · 303% treatment lapse · 16% missed or late test · 2

Across New York, 67% of violations are missed or late tests and 3% are water over a limit.

How far over the limit

at the limit2×5×10×100×+280528062025-07-01 · 2805: measured 38.10 NG/L vs limit 10.00 NG/L (3.8×)2025-07-01 · 2806: measured 28.20 NG/L vs limit 10.00 NG/L (2.8×)2025-04-01 · 2805: measured 43.70 NG/L vs limit 10.00 NG/L (4.4×)2025-04-01 · 2806: measured 22.40 NG/L vs limit 10.00 NG/L (2.2×)2025-01-01 · 2805: measured 41.60 NG/L vs limit 10.00 NG/L (4.2×)2025-01-01 · 2806: measured 20.20 NG/L vs limit 10.00 NG/L (2.0×)2024-10-01 · 2806: measured 26.95 NG/L vs limit 10.00 NG/L (2.7×)2024-10-01 · 2805: measured 50.90 NG/L vs limit 10.00 NG/L (5.1×)2024-07-01 · 2806: measured 26.70 NG/L vs limit 10.00 NG/L (2.7×)2024-07-01 · 2805: measured 54.50 NG/L vs limit 10.00 NG/L (5.5×)2024-04-01 · 2806: measured 19.70 NG/L vs limit 10.00 NG/L (2.0×)2024-04-01 · 2805: measured 40.40 NG/L vs limit 10.00 NG/L (4.0×)2024-01-01 · 2806: measured 19.40 NG/L vs limit 10.00 NG/L (1.9×)2024-01-01 · 2805: measured 38.20 NG/L vs limit 10.00 NG/L (3.8×)2023-10-01 · 2806: measured 25.00 NG/L vs limit 10.00 NG/L (2.5×)2023-10-01 · 2805: measured 38.00 NG/L vs limit 10.00 NG/L (3.8×)2023-07-01 · 2806: measured 20.70 NG/L vs limit 10.00 NG/L (2.1×)2023-07-01 · 2805: measured 39.70 NG/L vs limit 10.00 NG/L (4.0×)2023-04-01 · 2806: measured 22.60 NG/L vs limit 10.00 NG/L (2.3×)2023-04-01 · 2805: measured 41.30 NG/L vs limit 10.00 NG/L (4.1×)2023-01-01 · 2806: measured 19.40 NG/L vs limit 10.00 NG/L (1.9×)2023-01-01 · 2805: measured 41.20 NG/L vs limit 10.00 NG/L (4.1×)2022-10-01 · 2806: measured 29.10 NG/L vs limit 10.00 NG/L (2.9×)2022-10-01 · 2805: measured 54.20 NG/L vs limit 10.00 NG/L (5.4×)2022-07-01 · 2806: measured 26.50 NG/L vs limit 10.00 NG/L (2.6×)2022-07-01 · 2805: measured 47.30 NG/L vs limit 10.00 NG/L (4.7×)2022-04-01 · 2806: measured 23.50 NG/L vs limit 10.00 NG/L (2.4×)2022-04-01 · 2805: measured 36.70 NG/L vs limit 10.00 NG/L (3.7×)2022-01-01 · 2806: measured 27.50 NG/L vs limit 10.00 NG/L (2.8×)2022-01-01 · 2805: measured 51.70 NG/L vs limit 10.00 NG/L (5.2×)
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 17 results on file · action level 15 ppb

18.3 ppb
17.5 ppb
13.4 ppb
11.1 ppb
10.3 ppb
10.2 ppb
10 ppb
7.5 ppb
6 ppb
6 ppb
5.8 ppb
4.5 ppb
3 ppb
2 ppb
1.7 ppb
1.7 ppb
0 ppb

Every violation on record

  1. 2025-07-012805MCL, Averagemeasured 38.10 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  2. 2025-07-012806MCL, Averagemeasured 28.20 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  3. 2025-04-012805MCL, Averagemeasured 43.70 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  4. 2025-04-012806MCL, Averagemeasured 22.40 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  5. 2025-01-012805MCL, Averagemeasured 41.60 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  6. 2025-01-012806MCL, Averagemeasured 20.20 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  7. 2024-10-012806MCL, Averagemeasured 26.95 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  8. 2024-10-012805MCL, Averagemeasured 50.90 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  9. 2024-07-012806MCL, Averagemeasured 26.70 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  10. 2024-07-012805MCL, Averagemeasured 54.50 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  11. 2024-04-012806MCL, Averagemeasured 19.70 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  12. 2024-04-012805MCL, Averagemeasured 40.40 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  13. 2024-01-012806MCL, Averagemeasured 19.40 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  14. 2024-01-012805MCL, Averagemeasured 38.20 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  15. 2023-10-012806MCL, Averagemeasured 25.00 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  16. 2023-10-012805MCL, Averagemeasured 38.00 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  17. 2023-07-012806MCL, Averagemeasured 20.70 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  18. 2023-07-012805MCL, Averagemeasured 39.70 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  19. 2023-04-012806MCL, Averagemeasured 22.60 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  20. 2023-04-012805MCL, Averagemeasured 41.30 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  21. 2023-01-012806MCL, Averagemeasured 19.40 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  22. 2023-01-012805MCL, Averagemeasured 41.20 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  23. 2022-10-012806MCL, Averagemeasured 29.10 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  24. 2022-10-012805MCL, Averagemeasured 54.20 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  25. 2022-07-012806MCL, Averagemeasured 26.50 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
Show the other 8 entries
  1. 2022-07-012805MCL, Averagemeasured 47.30 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  2. 2022-04-012806MCL, Averagemeasured 23.50 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  3. 2022-04-012805MCL, Averagemeasured 36.70 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  4. 2022-01-012806MCL, Averagemeasured 27.50 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  5. 2022-01-012805MCL, Averagemeasured 51.70 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  6. 2019-07-01Lead and Copper RuleOCCT/SOWT Study/RecommendationBack in compliance
  7. 2019-04-01Revised Total Coliform RuleMONBack in compliance
  8. 2007-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance

System details

Population served400
Service connections1
Water sourceGroundwater
System typeNon-Transient Non-Community
OwnerLocal Government
StatusActive
CityArmonk
EPA ZIP on file10504

Areas served

  • Westchester County

Reading this record

West Patent Elementary School is a non-transient non-community that draws from groundwater and serves about 400 people in Armonk, New York. 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.