Public water system · NH1101050
ActiveMountain Lakes Water District
At a glance
Mountain Lakes Water District (PWSID NH1101050) is an active community water system in Grafton County, New Hampshire. It reports serving 787 people through 358 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in July 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
787
Service connections
358
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Mountain Lakes Water District compare with other water systems in Grafton County?
By EPA's size categories, Mountain Lakes Water District is a small system (501 to 3,300 people). Grafton County has 270 active public water systems. Its population served is about twice the county average of 394 people per system, and accounts for 0.7% of the 106,236 people reported by systems filed under the county. Across New Hampshire, the 2,450 active systems average 508 people each. Nationally, the average active community water system reports serving 6,703 people, so Mountain Lakes Water District is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. New Hampshire has 706 active community water systems, 29% of the state's 2,450 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,374 New Hampshire systems (97%) list groundwater as their primary source.
Who owns and regulates Mountain Lakes Water District?
EPA lists Mountain Lakes Water District as owned by a local government. The NH state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 37 of the 270 active systems in Grafton County (14%) are also owned by a local government.
Does Mountain Lakes Water District have drinking water violations?
Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in July 2022. The violations listed here began between January 1996 and July 2022. By type: 6 monitoring and reporting, 3 public notice, recordkeeping or other, 2 required treatment not met and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Consumer Confidence Rule (3 of them). EPA lists 12 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2022-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2016-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2016-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2015-08-20 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 2015-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2007-09-01 | Required treatment not metOCCT/SOWT Study/Recommendation · code 57 | Lead and Copper Rulecode 5000 | Yes | Resolved |
| 2007-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2007-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2004-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 1996-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | 2,4-Dcode 2105 | No | Resolved |
| 1996-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chlordanecode 2959 | No | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Mountain Lakes Water District: frequently asked questions
Who runs Mountain Lakes Water District?
Mountain Lakes Water District (PWSID NH1101050) is a community water system owned by a local government. It is regulated by the NH state drinking water program.
How many people does Mountain Lakes Water District serve?
Mountain Lakes Water District reports serving 787 people through 358 service connections in Grafton County, New Hampshire.
Where does Mountain Lakes Water District get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Mountain Lakes Water District have any drinking water violations?
Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in July 2022. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Mountain Lakes Water District's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 3 are health-based, and the most recent began in July 2022. For current results, consult the system's annual water quality report, EPA ECHO, or the NH state drinking water program.
Where can I find Mountain Lakes Water District's water quality report?
As a community water system, Mountain Lakes Water District must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Grafton County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Lebanon Water Dept | Grafton | 13,600 | Community | Surface water |
| Hanover Water Dept | Grafton | 9,600 | Community | Surface water |
| Plymouth Vlg Water and Sewer | Grafton | 6,700 | Community | Groundwater |
| Littleton Water and Light | Grafton | 6,500 | Community | Surface water |
| Bristol Water Works | Grafton | 3,575 | Community | Groundwater |
| Lincoln Water Works | Grafton | 3,300 | Community | Surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Mountain Lakes Water District, PWSID NH1101050, New Hampshire”, https://aquacensus.com/water-systems/new-hampshire/mountain-lakes-water-district-nh1101050 (data as of October 1, 2026).