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Rockville Pipeline Co

What EPA’s and Utah’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
240 people
Connections
140
Water source
Surface water bought from another system
Based in
Rockville, UT
County
Washington
Owner
Private
The ZIP code it serves

84763

The short answer

3 results are above the health goal. The worst: Lead, above the health goal. 1 health-based violation since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 1998 to 2025.

Arsenic, uranium, fluoride, chromium (total) and nitrate: Utah’s own results, samples taken from Sept. 22, 2020 to Jan. 21, 2026.

Total trihalomethanes (TTHM) and haloacetic acids (HAA5): EPA’s compliance monitoring file, samples taken from Aug. 14, 2012 to Oct. 21, 2019. Newer results are in the utility’s annual water quality report.

Above the health goal3

Lead

Comes from pipes, often your own

Above the health goal

3.0ppb

90th percentile, 2023 to 2025

In the latest period, 9 in 10 homes sampled were at or below 3.0 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

Arsenic

Comes from the source

Above the health goal

1.7ppb

Highest yearly average, 2022 to 2025

2025, one sample: 1.7 ppb

Averaged by year, the highest was 1.7 ppb, in 2022: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2025, the latest year on file, its one sample was 1.7 ppb.

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

0.93ppb

Highest yearly average, 2022 to 2024

Averaged by year, the highest was 0.93 ppb, in 2024: below EPA’s legal limit of 30 ppb, but above its health goal of zero. Its highest single sample was 1.2 ppb. That was also the latest year on file.

What handles it

Below EPA’s limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

57.1ppb

Highest yearly average, 2012 to 2019

2019 average: 30.1 ppb

Averaged by year, the highest was 57.1 ppb, in 2013, below EPA’s legal limit of 80 ppb. Its highest single sample was 81.7 ppb. In 2019, the latest year on file, its two samples averaged 30.1 ppb. EPA recorded no violation for total trihalomethanes (TTHM) at this utility from 2012 to 2019.

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

9.1ppb

Highest yearly average, 2012 to 2019

2019 average: 5.8 ppb

Averaged by year, the highest was 9.1 ppb, in 2012, below EPA’s legal limit of 60 ppb. Its highest single sample was 10.8 ppb. In 2019, the latest year on file, its two samples averaged 5.8 ppb.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.5ppm

Highest yearly average, 2022 to 2025

2025, one sample: 0.42 ppm

Averaged by year, the highest was 0.5 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. In 2025, the latest year on file, its one sample was 0.42 ppm.

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

Contaminant or ruleTypePeriodMeasuredStatus
Combined Radium (-226 and -228)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2024 to Dec. 31, 20247.0 PCI/LArchived
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 20 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, uranium, fluoride, chromium (total) and nitrate results here are Utah’s own from 2020 on, with EPA’s national file for 2012 to 2019. Total trihalomethanes (TTHM) and haloacetic acids (HAA5) come from EPA’s file alone, which ends in 2019. Rockville Pipeline Co’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; Utah’s results run from Sept. 22, 2020 to Jan. 21, 2026; EPA’s compliance samples are from Aug. 14, 2012 to Oct. 21, 2019.

Testing your own tap

Rockville Pipeline Co’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 Utah certifies.

The 3 labs Utah certifies closest to the area Rockville Pipeline Co serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Southwest Utah Public Health Laboratory

    St. George, UT · about 28 miles

    Certified for bacteria, nitrate

    (435) 986-2598

  • St. George RWRF Laboratory

    St. George, UT · about 31 miles

    Certified for bacteria

    (435) 627-4269

  • Southern Utah University Water Laboratory

    Cedar City, UT · about 37 miles

    Certified for nitrate, lead and copper, metals, minerals and other inorganics

    (435) 586-7914

All 60 certified labs for Utah

Sources

PWSID UTAH27014. Rebuilt from EPA data on Oct. 18, 2026.

Also in Washington County

All Utah utilities

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