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Mountain Lakes Water District

What EPA’s and CDC’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.

Serves
787 people
Connections
358
Water source
Groundwater
Based in
Haverhill, NH
County
Grafton
Owner
Local government
The 2 ZIP codes it serves

03740, 03785

The short answer

1 result is above EPA’s legal limit, and 2 more are above the health goal. The worst: Lead, above the action level. No health-based violations on file since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2006 to 2014.

Arsenic, total trihalomethanes (TTHM), haloacetic acids (HAA5) and nitrate: New Hampshire’s yearly averages per water system, as CDC’s Environmental Public Health Tracking Network publishes them, 2020 to 2023, with EPA’s 2012 to 2019 file for earlier years.

Uranium, fluoride and chromium (total): EPA’s compliance monitoring file, samples taken from June 28, 2016 to June 4, 2019. Newer results are in the utility’s annual water quality report.

Above the legal limit1

Lead

Comes from pipes, often your own

Above the action level

32ppb

90th percentile, 2014

In the latest period, 9 in 10 homes sampled were at or below 32 ppb, above EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027, and this result is at or above that. EPA’s health goal for lead is zero.

What handles it

Above the health goal2

Arsenic

Comes from the source

Above the health goal

0.95ppb

Highest yearly average, 2022

Averaged by year, the highest was 0.95 ppb, in 2022: below EPA’s legal limit of 10 ppb, but above its health goal of zero. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.8 ppb, in 2019.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Uranium

Comes from the source

Above the health goal

0.15ppb

Highest yearly average, 2016 to 2019

2019: not found

Averaged by year, the highest was 0.15 ppb, in 2016: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 0.3 ppb. In 2019, the latest year on file, it wasn’t found in its one sample.

What handles it

Below EPA’s limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

74.4ppb

Highest yearly average, 2020 to 2023

2023 average: 36.1 ppb

Averaged by year, the highest was 74.4 ppb, in 2022, below EPA’s legal limit of 80 ppb. In 2023, the latest year on file, it averaged 36.1 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 53.1 ppb, in 2016.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

19.7ppb

Highest yearly average, 2020 to 2023

2023 average: 15.7 ppb

Averaged by year, the highest was 19.7 ppb, in 2022, below EPA’s legal limit of 60 ppb. In 2023, the latest year on file, it averaged 15.7 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 39 ppb, in 2017.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.14ppm

Highest yearly average, 2016 to 2019

Averaged by year, the highest was 0.14 ppm, in 2019, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.27 ppm. That was also the latest year on file.

What handles it

2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)
  • Nitrate

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

  • NSF/ANSI 53

    Claims: Lead Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Lead, Arsenic

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claims: Lead Reduction, Arsenic (Pentavalent)<=50 ppb Reduction, Uranium

    For: Lead, Arsenic, Uranium

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best water filters for lead, ranked

The best reverse osmosis systems, ranked

Violations since 2016

No health-based violations on file with EPA since 2016. There are 3 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Arsenic, total trihalomethanes (TTHM), haloacetic acids (HAA5) and nitrate results here are New Hampshire’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Uranium, fluoride and chromium (total) come from EPA’s file alone, which ends in 2019. Mountain Lakes Water District’s own annual report, which it must send you every year, has newer results for those and the contaminants this page does not show.

  • Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.

  • What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.

  • Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; CDC’s yearly averages for New Hampshire cover 2020 to 2023; EPA’s compliance samples are from June 28, 2016 to June 4, 2019.

Testing your own tap

Mountain Lakes Water District’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab New Hampshire certifies.

The 3 labs New Hampshire certifies closest to the area Mountain Lakes Water District serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Vermont Agriculture Environmental Laboratory

    Randolph, VT · about 34 miles

    Certified for bacteria, PFAS

    (802) 461-3363

  • Endyne Inc.

    Lebanon, NH · about 36 miles

    Certified for bacteria, nitrate

    (603) 678-4891

  • Gorham Wastewater Treatment Facility Laboratory

    Gorham, NH · about 41 miles

    Certified for bacteria

    (603) 466-3104

All 63 certified labs for New Hampshire

Sources

PWSID NH1101050. Rebuilt from EPA data on Oct. 18, 2026.

Also in Grafton County

All New Hampshire utilities

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