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Robinson'S Corner MHP

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
20 people
Connections
20
Water source
Groundwater
Based in
Long Beach, CA
County
Butte
Owner
Private
Hardness
Very hard
The ZIP code it serves

95965

The short answer

1 result is above EPA’s legal limit, and 1 more is above the health goal. The worst: Nitrate, above the legal limit. 2 health-based violations since 2016.

What handles it

What was found

Nitrate, arsenic, fluoride, haloacetic acids (HAA5) and total trihalomethanes (TTHM): California’s own results, samples taken from March 4, 2020 to March 25, 2026, with EPA’s 2012 to 2019 file for earlier years.

Chromium (total): EPA’s compliance monitoring file, samples taken from June 15, 2018 to June 15, 2018. Newer results are in the utility’s annual water quality report.

Above the legal limit1

Nitrate

Comes from the source

Above the legal limit

11.9ppm

Highest sample; found in 21 of 21

2026, one sample: 1.7 ppm

From 2023 to 2024, three samples were above EPA’s legal limit of 10 ppm, the highest 11.9 ppm in 2023. The next sample at the same point, within 30 days, kept the average above the limit for one; two have no follow-up sample on file within 30 days. In 2026, the latest year on file, its one sample was 1.7 ppm. EPA recorded a violation for nitrate at this utility in 2023. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 5.9 ppm, in 2014.

What handles it

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

Above the health goal1

Arsenic

Comes from the source

Above the health goal

8.0ppb

Highest yearly average, 2021 to 2024

2024, one sample: 8.0 ppb

Averaged by year, the highest was 8.0 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 one sample was 8.0 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 10 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”

Below EPA’s limits1

Chromium (total)

Comes from the source

Below EPA’s limits

13ppb

Highest yearly average, 2018

Averaged by year, the highest was 13 ppb, in 2018, below EPA’s legal limit of 100 ppb. That is the only year on file.

What handles it

4 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Fluoride
  • Haloacetic acids (HAA5)
  • Lead
  • Total trihalomethanes (TTHM)

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: Nitrate/Nitrite (30 ppm challenge), Arsenic (Pentavalent)<=50 ppb Reduction

    For: Nitrate, Arsenic

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

  • NSF/ANSI 58

    Claims: Nitrate/Nitrite Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Nitrate, Arsenic

    Other certifiers’ wording: Nitrate; 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

Very hard, 278 mg/L (16.3 grains per gallon), at its one sampling point, in 2021.

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 16.3 grains per gallon, salt includedSoftener or salt-free conditioner?California water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Lead and Copper Rule RevisionsThe required inventory of lead service lines was not completed or submitted on time.EPA: LSL InventoryOct. 17, 2024—Unaddressed
NitrateThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2023 to Sept. 30, 202311.3 MG/LArchived
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 45 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Nitrate, arsenic, fluoride, haloacetic acids (HAA5) and total trihalomethanes (TTHM) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. Chromium (total) comes from EPA’s file alone, which ends in 2019. Robinson'S Corner MHP’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 March 4, 2020 to March 25, 2026; EPA’s compliance samples are from June 15, 2018 to June 15, 2018.

Testing your own tap

Robinson'S Corner 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 California certifies.

The 3 labs California certifies closest to the area Robinson'S Corner MHP serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Fruit Growers Laboratory, Inc.

    Chico, CA · about 18 miles

    Certified for bacteria

    (530) 343-5818

  • Cranmer Engineering, Inc.

    Grass Valley, CA · about 38 miles

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

    (530) 273-7284

  • Eurofins Sacramento Service Center

    West Sacramento, CA · about 69 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (626) 386-1221

All 145 certified labs for California

Sources

PWSID CA0400021. Rebuilt from EPA data on Oct. 18, 2026.

Also in Butte County

All California utilities

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