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Grandview MHP B

What EPA’s and Ohio’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
47 people
Connections
33
Water source
Groundwater
Based in
Mount Vernon, OH
County
Knox
Owner
Private

The short answer

2 results are above the limit’s level with no violation recorded, and 2 more are above the health goal. The worst: Total trihalomethanes (TTHM), above the limit’s level, no violation. No health-based violations on file since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2007 to 2026. Copper at 75.5 mg/L (2005) is left out of this report: it is one of the results Ohio sent EPA in 2006, all at µg/L magnitudes though EPA’s file marks them mg/L.

Total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, fluoride, nitrate and chromium (total): Ohio’s own results, samples taken from Feb. 6, 2020 to Nov. 5, 2025, with EPA’s 2012 to 2019 file for earlier years.

Above the limit’s level, no violation recorded2

Total trihalomethanes (TTHM)

Forms or is added in treatment

Above the limit’s level, no violation

147ppb

Highest yearly average, 2020 to 2025

2025 average: 126 ppb

Averaged by year, the highest was 147 ppb, in 2020, above EPA’s legal limit of 80 ppb. Its highest single sample was 308 ppb. In 2025, the latest year on file, its three samples averaged 126 ppb, above the limit. EPA judges this limit on running averages at each sampling point, and recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 64 ppb, in 2017.

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

Above the limit’s level, no violation

64.7ppb

Highest yearly average, 2020 to 2025

Averaged by year, the highest was 64.7 ppb, in 2025, above EPA’s legal limit of 60 ppb. Its highest single sample was 148 ppb. That was also the latest year on file. EPA judges this limit on running averages at each sampling point, and recorded no violation for haloacetic acids (HAA5) at this utility since 2020. Results like these with no violation often include water sampled before treatment or blending; the utility’s annual report says what reaches the tap. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 51.8 ppb, in 2017.

What handles it

No certification claim covers this compound yet.

Above the health goal2

Arsenic

Comes from the source

Above the health goal

6.8ppb

Highest yearly average, 2021 to 2024

Averaged by year, the highest was 6.8 ppb, in 2024: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 21 ppb. That was also the latest year on file. EPA recorded no violation for arsenic at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.5 ppb, in 2015.

What handles it

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

Lead

Comes from pipes, often your own

Above the health goal

0.7ppb

90th percentile, 2024 to 2026

In the latest period, 9 in 10 homes sampled were at or below 0.7 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Below EPA’s limits2

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.45ppm

Highest yearly average, 2021 to 2024

2024, one sample: 0.39 ppm

Averaged by year, the highest was 0.45 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. In 2024, the latest year on file, its one sample was 0.39 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.55 ppm, in 2015.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.3ppm

Highest sample; found in 3 of 6

2025: not found

The highest sample, in 2022, was 0.3 ppm, below EPA’s legal limit of 10 ppm. In 2025, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.21 ppm, in 2012.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)

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

    For: Total trihalomethanes (TTHM), Arsenic, Lead

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

  • NSF/ANSI 58

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

    For: Total trihalomethanes (TTHM), Arsenic, Lead

    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 reverse osmosis systems, ranked

The best water filters for lead, ranked

Violations since 2016

No health-based violations on file with EPA since 2016. There is 1 monitoring or reporting violation: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic, fluoride, nitrate and chromium (total) results here are Ohio’s own from 2020 on, with EPA’s national file for 2012 to 2019. Grandview MHP B’s own annual report, which it must send you every year, has 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; Ohio’s results run from Feb. 6, 2020 to Nov. 5, 2025.

Testing your own tap

Grandview MHP B’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 Ohio certifies.

No lab Ohio certifies is within 75 miles of the area Grandview MHP B serves on the state’s list. Some take samples by mail; the state’s page lists them all.

All 76 certified labs for Ohio

Sources

PWSID OH4202112. Rebuilt from EPA data on Oct. 18, 2026.

Also in Knox County

All Ohio utilities

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