Non-Transient Non-Community · PWSID NH0065020

Prospect Mountain High Sch

Serves 500 peopleGroundwaterOwner: Local GovernmentAlton, New HampshireServes a school or daycare
Nothing open right now.

On record since 2023: 4 violations. 4 over the limit. 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
0Treatment lapse
0Missed or late test
0Notice or report

More violations on record than 57% 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

20052010201520202023 · Over the limit: 12024 · Over the limit: 32024 · Over the limit: 32024 · Over the limit: 32025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
100% over the limit · 4

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

Every violation on record

  1. 2024-07-01ArsenicMCL, Averagemeasured 0.0110 MG/LBack in compliance
  2. 2024-04-01ArsenicMCL, Averagemeasured 0.0169 MG/LBack in compliance
  3. 2024-01-01ArsenicMCL, Averagemeasured 0.0207 MG/LBack in compliance
  4. 2023-10-01ArsenicMCL, Averagemeasured 0.0161 MG/LPeriod ended · no return to compliance on file

System details

Population served500
Service connections1
Water sourceGroundwater
System typeNon-Transient Non-Community
OwnerLocal Government
StatusActive
CityAlton
EPA ZIP on file03809

Areas served

  • Alton, Belknap County

Reading this record

Prospect Mountain High Sch is a non-transient non-community that draws from groundwater and serves about 500 people in Alton, 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.