Transient Non-Community · PWSID CT1020164

Mystic Koa

Serves 33 peopleGroundwaterOwner: PrivateNorth Stonington, Connecticut
Nothing open right now.

On record since 2004: 16 violations. 4 treatment lapses · 5 missed or late tests · 7 notices or reports. Most recent began 2023-09-14.

None of them is a measurement of contaminated water.

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

0Over the limit
4Treatment lapse
5Missed or late test
7Notice or report

More violations on record than 79% of active water systems in Connecticut. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

2004 · Notice or report: 1200520102014 · Missed or late test: 12014 · Notice or report: 12015 · Missed or late test: 22015 · Missed or late test: 22015 · Notice or report: 120152016 · Notice or report: 12018 · Treatment lapse: 12018 · Missed or late test: 22018 · Missed or late test: 22019 · Treatment lapse: 12019 · Notice or report: 120202022 · Treatment lapse: 12023 · Treatment lapse: 12023 · Notice or report: 22023 · Notice or report: 22025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
25% treatment lapse · 431% missed or late test · 544% notice or report · 7

Across Connecticut, 76% of violations are missed or late tests and 1% are water over a limit.

Every violation on record

  1. 2023-09-14Public NoticePN Violation without NPDWR ViolationBack in compliance
  2. 2023-06-22Public NoticePN Violation for NPDWR ViolationBack in compliance
  3. 2023-05-13Revised Total Coliform RuleTTBack in compliance
  4. 2022-05-20Revised Total Coliform RuleTTBack in compliance
  5. 2019-08-22Revised Total Coliform RuleTTBack in compliance
  6. 2019-01-11Public NoticePN Violation for NPDWR ViolationBack in compliance
  7. 2018-10-11Revised Total Coliform RuleTTBack in compliance
  8. 2018-10-01Revised Total Coliform RuleMONBack in compliance
  9. 2018-09-17E. ColiMonitoring, Source Water (GWR)Back in compliance
  10. 2016-05-07Public NoticePN Violation for NPDWR ViolationBack in compliance
  11. 2015-11-06Public NoticePN Violation for NPDWR ViolationBack in compliance
  12. 2015-10-29E. ColiMonitoring, Source Water (GWR)Back in compliance
  13. 2015-10-01E. ColiMonitoring, Source Water (GWR)Back in compliance
  14. 2014-10-03E. ColiMonitoring, Source Water (GWR)Back in compliance
  15. 2014-09-21Public NoticePN Violation for NPDWR ViolationBack in compliance
  16. 2004-07-31Public NoticePN Violation for NPDWR ViolationBack in compliance

System details

Population served33
Service connections275
Water sourceGroundwater
System typeTransient Non-Community
OwnerPrivate
StatusActive
CityNorth Stonington
EPA ZIP on file06359

Areas served

  • North Stonington, New London County

Reading this record

Mystic Koa is a transient non-community that draws from groundwater and serves about 33 people in North Stonington, Connecticut. 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.