Community Water System · PWSID NY5922909

North Castle Water District #4

Serves 1,225 peopleGroundwaterOwner: Local GovernmentArmonk, New York
Nothing open right now.

On record since 2015: 20 violations. 12 over the limit · 7 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.

12Over the limit
0Treatment lapse
7Missed or late test
1Notice or report

More violations on record than 81% 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

200520102015 · Missed or late test: 120152017 · Over the limit: 12017 · Missed or late test: 22017 · Missed or late test: 22018 · Missed or late test: 22018 · Missed or late test: 22019 · Over the limit: 12020 · Over the limit: 22020 · Over the limit: 22020 · Missed or late test: 120202021 · Missed or late test: 12022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42022 · Over the limit: 42022 · Notice or report: 12023 · Over the limit: 22023 · Over the limit: 22024 · Over the limit: 22024 · Over the limit: 22025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
60% over the limit · 1235% missed or late test · 75% notice or report · 1

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×+2806Manganese2024-10-01 · 2806: measured 11.80 NG/L vs limit 10.00 NG/L (1.2×)2024-01-01 · 2806: measured 11.65 NG/L vs limit 10.00 NG/L (1.2×)2023-04-01 · 2806: measured 12.30 NG/L vs limit 10.00 NG/L (1.2×)2023-01-01 · 2806: measured 11.30 NG/L vs limit 10.00 NG/L (1.1×)2022-10-01 · 2806: measured 11.15 NG/L vs limit 10.00 NG/L (1.1×)2022-07-01 · 2806: measured 11.85 NG/L vs limit 10.00 NG/L (1.2×)2022-04-01 · 2806: measured 12.30 NG/L vs limit 10.00 NG/L (1.2×)2022-01-01 · 2806: measured 11.60 NG/L vs limit 10.00 NG/L (1.2×)2020-10-01 · Manganese: measured 0.4000 MG/L vs limit 0.3000 MG/L (1.3×)2020-01-01 · Manganese: measured 382.50 UG/L vs limit 300.00 UG/L (1.3×)2019-10-01 · Manganese: measured 333.50 UG/L vs limit 300.00 UG/L (1.1×)2017-01-01 · Manganese: measured 403.00 UG/L vs limit 300.00 UG/L (1.3×)
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 8 results on file · action level 15 ppb

8.5 ppb
5.8 ppb
5 ppb
4.4 ppb
2.5 ppb
2.1 ppb
1.9 ppb
1.6 ppb

Every violation on record

  1. 2024-10-012806MCL, Averagemeasured 11.80 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  2. 2024-01-012806MCL, Averagemeasured 11.65 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  3. 2023-04-012806MCL, Averagemeasured 12.30 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  4. 2023-01-012806MCL, Averagemeasured 11.30 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  5. 2022-10-012806MCL, Averagemeasured 11.15 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  6. 2022-10-01Unknown contaminantOperations ReportBack in compliance
  7. 2022-07-012806MCL, Averagemeasured 11.85 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  8. 2022-04-012806MCL, Averagemeasured 12.30 NG/L · limit 10.00 NG/LPeriod ended · no return to compliance on file
  9. 2022-01-012806MCL, Averagemeasured 11.60 NG/L · limit 10.00 NG/LBack in compliance
  10. 2021-04-01IronMonitoring, RegularBack in compliance
  11. 2020-10-01ManganeseMCL, Averagemeasured 0.4000 MG/L · limit 0.3000 MG/LBack in compliance
  12. 2020-01-01ManganeseMCL, Averagemeasured 382.50 UG/L · limit 300.00 UG/LBack in compliance
  13. 2020-01-01Revised Total Coliform RuleMONBack in compliance
  14. 2019-10-01ManganeseMCL, Averagemeasured 333.50 UG/L · limit 300.00 UG/LBack in compliance
  15. 2018-01-01ManganeseMonitoring, Check/Repeat/ConfirmationBack in compliance
  16. 2018-01-01Revised Total Coliform RuleMONBack in compliance
  17. 2017-03-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  18. 2017-01-01ManganeseMCL, Averagemeasured 403.00 UG/L · limit 300.00 UG/LBack in compliance
  19. 2017-01-01Revised Total Coliform RuleMONPeriod ended · no return to compliance on file
  20. 2015-01-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance

System details

Population served1,225
Service connections401
Water sourceGroundwater
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityArmonk
EPA ZIP on file10504

Areas served

  • Westchester County

Reading this record

North Castle Water District #4 is a community water system that draws from groundwater and serves about 1,225 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.