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Oak Knoll Est MHP

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
350 people
Connections
102
Water source
Groundwater
Based in
Morgantown, PA
County
Dauphin
Owner
Private
The ZIP code it serves

17022

The short answer

1 result is above EPA’s legal limit, 2 more are above EPA’s new limit, which takes effect in 2029, and 2 more are above the health goal. The worst: Lead, above the action level. 1 health-based violation since 2016.

What handles it

What was found

PFAS: Pennsylvania’s own results under its PFAS rule, entry point samples taken from Jan. 9, 2024 to Sept. 8, 2026.

Lead and copper: EPA SDWIS monitoring periods ending 1994 to 1998.

Arsenic, uranium, nitrate, total trihalomethanes (TTHM), haloacetic acids (HAA5), chromium (total) and fluoride: Pennsylvania’s own results, samples taken from Jan. 6, 2020 to July 14, 2026, with EPA’s 2012 to 2019 file for earlier years.

PFAS: PFOS, PFOA, 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 EPA’s new limit (2029)4.5 ppt highest, found in 11 of 11 samples. Details
PFOS4.0 pptAbove EPA’s new limit (2029)7.2 ppt highest, found in 17 of 17 samples. Details
PFHxS10 pptBelow EPA’s limits2.4 ppt highest, found in 6 of 8 samples. Details
PFNA10 pptNot foundNot found in any of 8 samples
HFPO-DA (GenX)10 pptNot foundNot found in any of 8 samples
PFBSIndex onlyBelow EPA’s limits4.9 ppt highest, found in 7 of 8 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 legal limit1

Lead

Comes from pipes, often your own

Above the action level

16ppb

90th percentile, 1998

In the latest period, 9 in 10 homes sampled were at or below 16 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 EPA’s new limit, which takes effect in 20292

PFOS

Comes from the source

Above EPA’s new limit (2029)

7.2ppt

Highest sample, Jan. 9, 2024; found in 17 of 17

2026 average: 4.8 ppt

The highest sample was 7.2 ppt, above EPA’s new limit of 4.0 ppt, which takes effect in 2029. EPA’s health goal is zero. Compliance will be judged on a running annual average, not one sample. Averaged over four quarters at one entry point, the way both Pennsylvania’s limit and EPA’s are judged, the highest was 5.4 ppt, for the year to Sept. 30, 2026: below Pennsylvania’s limit of 18 ppt and above EPA’s new limit of 4.0 ppt. In 2026, the latest year on file, its six samples averaged 4.8 ppt.

What handles it

PFOA

Comes from the source

Above EPA’s new limit (2029)

4.5ppt

Highest sample, Jan. 9, 2024; found in 11 of 11

2025 average: 3.1 ppt

The highest sample was 4.5 ppt, above EPA’s new limit of 4.0 ppt, which takes effect in 2029. EPA’s health goal is zero. Compliance will be judged on a running annual average, not one sample. Averaged over four quarters at one entry point, the way both Pennsylvania’s limit and EPA’s are judged, the highest was 3.5 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 2025, the latest year on file, its eight samples averaged 3.1 ppt.

What handles it

Above the health goal2

Arsenic

Comes from the source

Above the health goal

3.0ppb

Highest yearly average, 2021 to 2024

2024 average: 3.0 ppb

Averaged by year, the highest was 3.0 ppb, in 2021: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2024, the latest year on file, its two samples averaged 3.0 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 2.0 ppb, in 2018.

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

5.2ppb

Highest yearly average, 2022

Averaged by year, the highest was 5.2 ppb, in 2022: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 6.7 ppb. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.009 ppb, in 2013.

What handles it

Below EPA’s limits5

Nitrate

Comes from the source

Below EPA’s limits

9.8ppm

Highest sample; found in 52 of 52

2026 average: 7.4 ppm

The highest sample, in 2025, was 9.8 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its six samples averaged 7.4 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 10.3 ppm, in 2019.

What handles it

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

PFHxS

Comes from the source

Below EPA’s limits

2.4ppt

Highest sample, Oct. 14, 2025; found in 6 of 8

2025 average: 1.4 ppt

The highest sample was 2.4 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 1.5 ppt, for the year to Dec. 31, 2025: below EPA’s new limit of 10 ppt. Its only year on file is 2025, when its eight samples averaged 1.4 ppt.

What handles it

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

5.3ppb

Highest yearly average, 2021 to 2024

Averaged by year, the highest was 5.3 ppb, in 2024, below EPA’s legal limit of 80 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 10 ppb, in 2018.

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

1.9ppb

Highest yearly average, 2021 to 2024

2024: not found

Averaged by year, the highest was 1.9 ppb, in 2021, below EPA’s legal limit of 60 ppb. In 2024, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.0 ppb, in 2015.

What handles it

No certification claim covers this compound yet.

PFBS

Comes from the source

Below EPA’s limits

4.9ppt

Highest sample, Oct. 14, 2025; found in 7 of 8

2025 average: 2.9 ppt

The highest sample was 4.9 ppt, below EPA’s hazard index benchmark of 2,000 ppt. PFBS has no legal limit or health goal of its own. Its only year on file is 2025, when its eight samples averaged 2.9 ppt.

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

  • Chromium (total)
  • Fluoride

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

    For: Lead, PFOS, PFOA, Arsenic

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

  • NSF/ANSI 58

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

    For: Lead, PFOS, PFOA, 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 water filters for PFAS, ranked

The best reverse osmosis systems, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)Sept. 1, 2019 to Sept. 30, 2019—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 17 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, uranium, nitrate, total trihalomethanes (TTHM), haloacetic acids (HAA5), chromium (total) and fluoride results here are Pennsylvania’s own from 2020 on, with EPA’s national file for 2012 to 2019. Oak Knoll Est MHP’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 Jan. 6, 2020 to July 14, 2026; Pennsylvania’s PFAS results run from Jan. 9, 2024 to Sept. 8, 2026.

Testing your own tap

Oak Knoll Est MHP’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 Oak Knoll Est MHP serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • ALS Environmental - Middletown

    Middletown, PA · about 6 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS, radioactivity

    (717) 944-5541

  • H2O Environmental LLC

    Harrisburg, PA · about 12 miles

    Certified for bacteria

    (717) 743-9310

  • Owl Hill Laboratories LLC

    Lititz, PA · about 17 miles

    Certified for bacteria

    (717) 627-2520

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 PA7220001. Rebuilt from EPA data on Oct. 18, 2026.

Also in Dauphin County

All Pennsylvania utilities

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