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Stoneridge Master

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
681 people
Connections
268
Water source
Groundwater
Based in
Chapel Hill, NC
County
Orange
Owner
Private
The ZIP code it serves

27514

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Copper, 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 2016 to 2023.

Uranium, total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic and nitrate: North Carolina’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.

Fluoride and chromium (total): EPA’s compliance monitoring file, samples taken from April 17, 2012 to April 18, 2018. Newer results are in the utility’s annual water quality report.

Above the legal limit1

Copper

Comes from pipes, often your own

Above the action level

1.6ppm

90th percentile, 2023

In the latest period, 9 in 10 homes sampled were at or below 1.6 ppm, above EPA’s action level of 1.3 ppm.

What handles it

Above the health goal1

Uranium

Comes from the source

Above the health goal

0.53ppb

Highest yearly average, 2022

Averaged by year, the highest was 0.53 ppb, in 2022: below EPA’s legal limit of 30 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 1.6 ppb, in 2019.

What handles it

Below EPA’s limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

13.2ppb

Highest yearly average, 2020 to 2023

2023: not found

Averaged by year, the highest was 13.2 ppb, in 2020, below EPA’s legal limit of 80 ppb. In 2023, the latest year on file, it wasn’t found. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 15 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

4.0ppb

Highest yearly average, 2020 to 2023

2023: not found

Averaged by year, the highest was 4.0 ppb, in 2020, below EPA’s legal limit of 60 ppb. In 2023, the latest year on file, it wasn’t found. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 4.4 ppb, in 2018.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.065ppm

Highest yearly average, 2012 to 2018

2018: not found

Averaged by year, the highest was 0.065 ppm, in 2012, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.16 ppm. In 2018, the latest year on file, it wasn’t found in any of its four samples.

What handles it

4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Lead
  • 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.”

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

Violations since 2016

No health-based violations on file with EPA since 2016. There are 5 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Uranium, total trihalomethanes (TTHM), haloacetic acids (HAA5), arsenic and nitrate results here are North Carolina’s yearly averages as CDC publishes them, from 2020 on, with EPA’s national file for 2012 to 2019. Fluoride and chromium (total) come from EPA’s file alone, which ends in 2019. Stoneridge Master’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 North Carolina cover 2020 to 2023; EPA’s compliance samples are from April 17, 2012 to April 18, 2018.

Testing your own tap

Stoneridge Master’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 North Carolina certifies.

The 3 labs North Carolina certifies closest to the area Stoneridge Master serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Onterris Laboratories, LLC - Durham

    Durham, NC · about 9 miles

    Certified for bacteria

    (804) 358-8295

  • Durham County Health Department

    Durham, NC · about 9 miles

    Certified for bacteria

    (919) 560-7975

  • RTI International

    Research Triangle Park, NC · about 13 miles

    Certified for lead and copper, metals

    (919) 485-5520

All 112 certified labs for North Carolina

Sources

PWSID NC0368185. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Orange County

All North Carolina utilities

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