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Masons Mobile City

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

Serves
140 people
Connections
67
Water source
Groundwater
Based in
Moscow, PA
County
Warren
Owner
Private
Hardness
Moderately hard
The ZIP code it serves

16365

The short answer

4 results are above the health goal. The worst: Arsenic, above the health goal. 10 health-based violations since 2016.

What handles it

What was found

PFAS: Pennsylvania’s own results under its PFAS rule, entry point samples taken from Feb. 17, 2025 to Sept. 14, 2026.

Lead and copper: EPA SDWIS monitoring periods ending 1993 to 1996.

Arsenic, fluoride, chromium (total), total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5) and uranium: Pennsylvania’s own results, samples taken from March 9, 2020 to Sept. 14, 2026, with EPA’s 2012 to 2019 file for earlier years.

PFAS: PFOA, PFOS, PFHxS and PFBS were found, of the six PFAS in EPA’s 2024 drinking water rule; their results are below.

EPA’s 2024 PFAS rule, compound by compound

PFASEPA’s limitResult
PFOA4.0 pptAbove the health goal1.0 ppt highest, found in 2 of 13 samples. Details
PFOS4.0 pptAbove the health goal0.95 ppt highest, found in 2 of 13 samples. Details
PFHxS10 pptBelow EPA’s limits0.4 ppt highest, found in 1 of 13 samples. Details
PFNA10 pptNot foundNot found in any of 13 samples
HFPO-DA (GenX)10 pptNot foundNot found in any of 13 samples
PFBSIndex onlyBelow EPA’s limits0.47 ppt highest, found in 2 of 13 samples. Details
Results from Pennsylvania’s own PFAS monitoring, samples where water enters the pipes; each compound’s card has its four-quarter averages, the way limits are judged. The limits are EPA’s 2024 rule, with compliance due from 2029; EPA has since proposed changes to some of them, explained on each compound’s page. Pennsylvania’s own limits for PFOA and PFOS are in force now. PFBS has no limit of its own and counts only toward EPA’s Hazard Index, which TapBuff works out only from UCMR 5’s averages, so it isn’t given here.

About PFAS certifications

NSF’s PFAS claims are tested to below 20 ppt. EPA’s limit is 4.0 ppt, and EPA says no certification yet shows a filter reaching its levels.

Above the health goal4

Arsenic

Comes from the source

Above the health goal

3.6ppb

Highest yearly average, 2020 to 2026

Averaged by year, the highest was 3.6 ppb, in 2026: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 11 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 8.4 ppb, in 2017.

What handles it

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

PFOA

Comes from the source

Above the health goal

1.0ppt

Highest sample, Feb. 17, 2025; found in 2 of 13

2026: not found

The highest sample was 1.0 ppt: below EPA’s new limit of 4.0 ppt, which takes effect in 2029, but above its health goal of zero. Averaged over four quarters at one entry point, the way both Pennsylvania’s limit and EPA’s are judged, the highest was 0.24 ppt, for the year to Dec. 31, 2025: below Pennsylvania’s limit of 14 ppt and below EPA’s new limit of 4.0 ppt. In 2026, the latest year on file, it wasn’t found in any of its five samples.

What handles it

PFOS

Comes from the source

Above the health goal

0.95ppt

Highest sample, Feb. 17, 2025; found in 2 of 13

2026: not found

The highest sample was 0.95 ppt: below EPA’s new limit of 4.0 ppt, which takes effect in 2029, but above its health goal of zero. Averaged over four quarters at one entry point, the way both Pennsylvania’s limit and EPA’s are judged, the highest was 0.2 ppt, for the year to Dec. 31, 2025: below Pennsylvania’s limit of 18 ppt and below EPA’s new limit of 4.0 ppt. In 2026, the latest year on file, it wasn’t found in any of its five samples.

What handles it

Lead

Comes from pipes, often your own

Above the health goal

1.0ppb

90th percentile, 1996

In the latest period, 9 in 10 homes sampled were at or below 1.0 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 limits6

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.24ppm

Highest yearly average, 2021 to 2024

Averaged by year, the highest was 0.24 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.48 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.5 ppm, in 2018.

What handles it

PFHxS

Comes from the source

Below EPA’s limits

0.4ppt

Highest sample, Feb. 17, 2025; found in 1 of 13

2026: not found

The highest sample was 0.4 ppt, below EPA’s new limit of 10 ppt, which takes effect in 2029. Averaged over four quarters at one entry point, the way EPA’s limit is judged, the highest was 0 ppt, for the year to June 30, 2026: below EPA’s new limit of 10 ppt. In 2026, the latest year on file, it wasn’t found in any of its five samples.

What handles it

Chromium (total)

Comes from the source

Below EPA’s limits

2.8ppb

Highest yearly average, 2021 to 2024

Averaged by year, the highest was 2.8 ppb, in 2024, below EPA’s legal limit of 100 ppb. Its highest single sample was 2.9 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 10.8 ppb, in 2015.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

1.6ppb

Highest yearly average, 2022 to 2025

2025: not found

Averaged by year, the highest was 1.6 ppb, in 2022, below EPA’s legal limit of 80 ppb. Its highest single sample was 3.2 ppb. In 2025, the latest year on file, it wasn’t found in any of its two samples. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 41.5 ppb, in 2014.

What handles it

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

Nitrate

Comes from the source

Below EPA’s limits

0.11ppm

Highest sample; found in 1 of 13

2026 average: 0.035 ppm

The highest sample, in 2026, was 0.11 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its three samples averaged 0.035 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 0.01 ppm, in 2012.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

PFBS

Comes from the source

Below EPA’s limits

0.47ppt

Highest sample, Feb. 17, 2025; found in 2 of 13

2026: not found

The highest sample was 0.47 ppt, below EPA’s hazard index benchmark of 2,000 ppt. PFBS has no legal limit or health goal of its own. In 2026, the latest year on file, it wasn’t found in any of its five samples.

What handles it

4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.

From routine monitoring

  • Haloacetic acids (HAA5)
  • Uranium

PFAS, from Pennsylvania’s own monitoring

  • HFPO-DA (GenX)
  • PFNA

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

    For: Arsenic, PFOA, PFOS, Lead

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level); Total PFAS Reduction; Perfluorooctanoic Acid (PFOA); Perfluorooctane Sulfonate (PFOS)

  • NSF/ANSI 58

    Claims: Arsenic (Pentavalent)<=50 ppb Reduction, Perfluorooctanoic Acid (PFOA), Perfluorooctane Sulfonate (PFOS), Lead Reduction

    For: Arsenic, PFOA, PFOS, 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 PFAS, ranked

The best water filters for lead, ranked

Hardness

Moderately hard, 87 mg/L (5.1 grains per gallon), at its one sampling point, in 2026.

Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.

Softeners compared at 5.1 grains per gallon, salt includedSoftener or salt-free conditioner?Pennsylvania water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)July 1, 2026 to July 31, 2026—Archived
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)June 1, 2026 to June 30, 2026—Archived
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)May 1, 2026 to May 31, 2026—Archived
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)April 1, 2026 to April 30, 2026—Archived
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)March 1, 2026 to March 31, 2026—Archived
Revised Total Coliform RuleFixes required after coliform results were not made on time.EPA: Treatment Technique, Corrective/Expedited Actions (RTCR)Feb. 17, 2026—Resolved
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Feb. 1, 2026 to Feb. 28, 2026—Archived
Revised Total Coliform RuleFixes required after coliform results were not made on time.EPA: Treatment Technique, Corrective/Expedited Actions (RTCR)Jan. 1, 2026—Unaddressed
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Jan. 1, 2026 to Jan. 31, 2026—Archived
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Jan. 1, 2023 to Jan. 31, 2023—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 27 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, fluoride, chromium (total), total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5) and uranium results here are Pennsylvania’s own from 2020 on, with EPA’s national file for 2012 to 2019. Masons Mobile City’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; Pennsylvania’s results run from March 9, 2020 to Sept. 14, 2026; Pennsylvania’s PFAS results run from Feb. 17, 2025 to Sept. 14, 2026.

Testing your own tap

Masons Mobile City’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 Pennsylvania certifies.

The 3 labs Pennsylvania certifies closest to the area Masons Mobile City serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • White Oak Laboratory LLC

    Ridgway, PA · about 36 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (814) 772-5927

  • Cattaraugus County Department of Health Laboratory

    Olean, NY · about 42 miles

    Certified for bacteria

    (716) 701-3434

  • Microbac Laboratories, Inc - Erie Division

    Erie, PA · about 45 miles

    Certified for bacteria

    (814) 825-8533

Penn State Agricultural Analytical Services Laboratory: Drinking water test kits from many county Extension offices, mailed back to the lab overnight with payment. Packages cover bacteria and basic chemistry, with add-ons for nitrate, metals, lead, and mining or gas drilling concerns. The standard package of bacteria, pH and total dissolved solids is $60, or $70 with nitrate; bacteria alone is $40, nitrate $15 and lead $25. Drinking Water Testing, Penn State Agricultural Analytical Services Lab.

All 108 certified labs for Pennsylvania

Sources

PWSID PA6620036. Rebuilt from EPA data on Oct. 18, 2026.

Also in Warren County

All Pennsylvania utilities

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