Community Water System · PWSID NH1141020

Emerald Lake

Serves 1,300 peopleGroundwaterOwner: Local GovernmentHillsboro, New Hampshire
1 open treatment violation.

Open for: Groundwater Rule. EPA counts treatment-technique violations as health-based: a required protective step was not done. It is not a measurement of contamination.

On record since 2002: 22 violations. 4 over the limit · 2 treatment lapses · 4 missed or late tests · 12 notices or reports. Most recent began 2024-07-01.

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

4Over the limit
2Treatment lapse1 open
4Missed or late test
12Notice or report1 open

More violations on record than 95% of active water systems in New Hampshire. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

2002 · Notice or report: 12005 · Notice or report: 120052006 · Notice or report: 22006 · Notice or report: 22007 · Notice or report: 120102011 · Notice or report: 32011 · Notice or report: 32011 · Notice or report: 32013 · Treatment lapse: 12013 · Notice or report: 120152016 · Missed or late test: 12016 · Notice or report: 12019 · Over the limit: 32019 · Over the limit: 32019 · Over the limit: 32020 · Over the limit: 12020 · Treatment lapse: 12020 · Notice or report: 120202021 · Missed or late test: 12021 · Notice or report: 12024 · Missed or late test: 22024 · Missed or late test: 22025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
18% over the limit · 49% treatment lapse · 218% missed or late test · 455% notice or report · 12

Across New Hampshire, 37% of violations are missed or late tests and 7% are water over a limit.

Open now (2)

  1. 2020-10-02Groundwater RuleFailure To Address DeficiencyOpen
  2. 2002-01-27Public NoticePN Violation for NPDWR ViolationOpen

Every violation on record

  1. 2024-07-01Total Haloacetic Acids (HAA5)Monitoring and Reporting (DBP)Back in compliance
  2. 2024-07-01Trihalomethanes (TTHM)Monitoring and Reporting (DBP)Back in compliance
  3. 2021-11-10Revised Total Coliform RuleRPTBack in compliance
  4. 2021-10-01Revised Total Coliform RuleMONBack in compliance
  5. 2020-10-02Groundwater RuleFailure To Address DeficiencyOpen
  6. 2020-01-23Public NoticePN Violation for NPDWR ViolationBack in compliance
  7. 2020-01-01ArsenicMCL, Averagemeasured 0.0130 MG/LBack in compliance
  8. 2019-10-01ArsenicMCL, Averagemeasured 0.0230 MG/LBack in compliance
  9. 2019-07-01ArsenicMCL, Averagemeasured 0.0230 MG/LBack in compliance
  10. 2019-04-01ArsenicMCL, Averagemeasured 0.0150 MG/LBack in compliance
  11. 2016-09-15E. ColiMonitoring, Source Water (GWR)Back in compliance
  12. 2016-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  13. 2013-06-12Public NoticePN Violation for NPDWR ViolationBack in compliance
  14. 2013-04-24Groundwater RuleFailure To Address DeficiencyBack in compliance
  15. 2011-12-25Public NoticePN Violation for NPDWR ViolationBack in compliance
  16. 2011-09-26Public NoticePN Violation for NPDWR ViolationBack in compliance
  17. 2011-09-18Public NoticePN Violation for NPDWR ViolationBack in compliance
  18. 2007-10-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  19. 2006-07-01Consumer Confidence RuleCCR Inadequate ReportingBack in compliance
  20. 2006-06-15Public NoticePN Violation for NPDWR ViolationBack in compliance
  21. 2005-09-22Public NoticePN Violation for NPDWR ViolationBack in compliance
  22. 2002-01-27Public NoticePN Violation for NPDWR ViolationOpen

System details

Population served1,300
Service connections528
Water sourceGroundwater
System typeCommunity Water System
OwnerLocal Government
StatusActive
CityHillsboro
EPA ZIP on file03244

Areas served

  • Hillsborough, Hillsborough

Reading this record

Emerald Lake is a community water system that draws from groundwater and serves about 1,300 people in Hillsboro, New Hampshire. 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.