Public water system record

Locke Lake

Serves an area of Belknap County, NH · 2,280 people served

Federal records show 2 health-based violations and no monitoring/reporting issues for Locke Lake in the last ten years. The most serious issue in this window was a resolved Arsenic violation.

NH0142010
NASHUA
NH
2,280 served

System profile

Source water Surface water

ZIP 03064

EPA system ID NH0142010

Verify this system on EPA ECHO →

Health-based violations, last 10 years: 2
Resolved: 2
Unresolved: 0
Any acute record: No
Monitoring issues, last 10 years: 0

Key facts

Locke Lake draws water from 7 wells and 1 surface water intake.
Highest measured level in the last 10 years: Arsenic, 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit), 2018.
Most recent enforcement action: boil water order by New Hampshire, September 1991.
Record on file since 1991, with 7 health-based violations before October 19, 2016.

Check whether Locke Lake serves your address

Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant	Rule family	Start date	Status	Acute
Arsenic Contaminant limit exceeded Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	330	Apr 1, 2018	Resolved	No
Arsenic Contaminant limit exceeded Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)	330	Jan 1, 2018	Resolved	No

Full record since 1991

EPA's records for Locke Lake go back to 1991. Before October 19, 2016 they list 7 health-based violations (6 resolved, 1 archived by EPA without a recorded fix) and 64 monitoring or reporting violations.

Violations that began in	Health-based	Monitoring and reporting
1990s	2	61
2000s	3	1
2010 to October 18, 2016	2	2
October 19, 2016 to 2019	2	0

Most recent health-based violation before October 19, 2016: Total Coliform, began August 2012, Resolved.

Show all 7 health-based violations before October 19, 2016

Contaminant	Start date	Status
Total Coliform Contaminant limit exceeded	Aug 1, 2012	Resolved
Total Coliform Contaminant limit exceeded	Mar 1, 2012	Resolved
Arsenic Contaminant limit exceeded Measured 0.021 mg/L, federal limit 0.01 mg/L (2.1 times the limit)	Jul 1, 2007	Resolved
Arsenic Contaminant limit exceeded Measured 0.015 mg/L, federal limit 0.01 mg/L (1.5 times the limit)	Apr 1, 2007	Resolved
Arsenic Contaminant limit exceeded Measured 0.016 mg/L, federal limit 0.01 mg/L (1.6 times the limit)	Jan 1, 2007	Resolved
Total Coliform Contaminant limit exceeded	Sep 1, 1993	Archived
Total Coliform (acute) Contaminant limit exceeded	Sep 1, 1991	Resolved

Enforcement actions

New Hampshire regulators issued 1 boil water order to Locke Lake in 1991. The most recent was a boil water order in September 1991.

Date	By	Action	Violations covered
Sep 30, 1991	New Hampshire	Boil water order	1 violation (1 health-based): Total Coliform

What the violations mean

Arsenic

2 incidents

Arsenic exceeded the federal limit

Long-term arsenic exposure is linked to cancer and cardiovascular effects

Where the water comes from

Locke Lake draws water from 7 wells and 1 surface water intake.

Annual water quality report

Locke Lake must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by New Hampshire.

Certified drinking water labs by state EPA guidance for private wells