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Sid - Pleasant Hills Ranch

What EPA’s and California’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
89 people
Connections
27
Water source
Surface water
Based in
Vacaville, CA
County
Solano
Owner
Local government
Hardness
Hard
The ZIP code it serves

95688

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Haloacetic acids (HAA5), above the legal limit. 7 health-based violations since 2016.

What handles it

What was found

Haloacetic acids (HAA5), arsenic, total trihalomethanes (TTHM), fluoride, nitrate and chromium (total): California’s own results, samples taken from Jan. 13, 2020 to April 14, 2026, with EPA’s 2012 to 2019 file for earlier years.

Uranium: EPA’s compliance monitoring file, samples taken from May 10, 2018 to Nov. 15, 2018. Newer results are in the utility’s annual water quality report.

Above the legal limit1

Haloacetic acids (HAA5)

Forms or is added in treatment

Above the legal limit

71ppb

Highest yearly average, 2020 to 2026

2026 average: 32 ppb

Averaged by year, the highest was 71 ppb, in 2022, above EPA’s legal limit of 60 ppb. Its highest single sample was 89 ppb. In 2026, the latest year on file, its two samples averaged 32 ppb. EPA recorded violations for haloacetic acids (HAA5) at this utility in 2022 and 2023. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 55 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

Above the health goal1

Arsenic

Comes from the source

Above the health goal

2.4ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 2.4 ppb, in 2022: below EPA’s legal limit of 10 ppb, but above its health goal of zero. Its highest single sample was 2.4 ppb. In 2026, 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 2.3 ppb, in 2016.

What handles it

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

Below EPA’s limits3

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

73ppb

Highest yearly average, 2020 to 2026

2026 average: 58 ppb

Averaged by year, the highest was 73 ppb, in 2025, below EPA’s legal limit of 80 ppb. Its highest single sample was 89 ppb. In 2026, the latest year on file, its two samples averaged 58 ppb. EPA recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 51.8 ppb, in 2019.

What handles it

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

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.15ppm

Highest yearly average, 2020 to 2026

2026, one sample: 0.14 ppm

Averaged by year, the highest was 0.15 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. In 2026, the latest year on file, its one sample was 0.14 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.13 ppm, in 2016.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.16ppm

Highest sample; found in 1 of 10

2026: not found

The highest sample, in 2024, was 0.16 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, it wasn’t found in its one sample.

What handles it

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

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

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

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

  • NSF/ANSI 58

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

At the tap, or for the whole house?

These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. 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

Hardness

Hard, typically 170 mg/L (9.9 grains per gallon), across 3 sampling points, 2019 to 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 9.9 grains per gallon, salt includedSoftener or salt-free conditioner?California water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Total Haloacetic Acids (HAA5)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2023 to Dec. 31, 20230.066 MG/LResolved
Total Haloacetic Acids (HAA5)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2023 to Sept. 30, 20230.067 MG/LResolved
Total Haloacetic Acids (HAA5)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2023 to June 30, 20230.063 MG/LResolved
Total Haloacetic Acids (HAA5)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2023 to March 31, 20230.064 MG/LResolved
Total Haloacetic Acids (HAA5)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2022 to Dec. 31, 20220.068 MG/LResolved
Total Haloacetic Acids (HAA5)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2022 to Sept. 30, 20220.064 MG/LResolved
Total Haloacetic Acids (HAA5)The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2022 to June 30, 20220.061 MG/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record.

What this report can’t tell you

  • Everything else. Haloacetic acids (HAA5), arsenic, total trihalomethanes (TTHM), fluoride, nitrate and chromium (total) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Uranium comes from EPA’s file alone, which ends in 2019. Sid - Pleasant Hills Ranch’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; California’s results run from Jan. 13, 2020 to April 14, 2026; EPA’s compliance samples are from May 10, 2018 to Nov. 15, 2018.

Testing your own tap

Sid - Pleasant Hills Ranch’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 California certifies.

The 3 labs California certifies closest to the area Sid - Pleasant Hills Ranch serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Napa-Solano-Yolo-Marin Public Health Laboratory

    Fairfield, CA · about 12 miles

    Certified for bacteria

    (707) 784-4410

  • Caltest Analytical Laboratory

    Napa, CA · about 18 miles

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

    (707) 258-4000

  • McCampbell Analytical, Inc.

    Pittsburg, CA · about 27 miles

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

    (925) 252-9262

All 145 certified labs for California

Sources

PWSID CA4810025. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Solano County

All California utilities

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