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North Shore MWC

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
7 people
Connections
33
Water source
Groundwater
Based in
Fawnskin, CA
County
San Bernardino
Owner
Private
Hardness
Moderately hard
The ZIP code it serves

92333

The short answer

2 results are above EPA’s legal limit. The worst: Uranium, above the legal limit. 13 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2025 to 2027.

Uranium, fluoride, arsenic, chromium (total), nitrate and total trihalomethanes (TTHM): California’s own results, samples taken from Feb. 11, 2020 to June 10, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit2

Uranium

Comes from the source

Above the legal limit

46.4ppb

Highest yearly average, 2020 to 2026

2026 average: 7.0 ppb

Averaged by year, the highest was 46.4 ppb, in 2020, above EPA’s legal limit of 30 ppb. Its highest single sample was 61.1 ppb. In 2026, the latest year on file, its eight samples averaged 7.0 ppb. EPA recorded violations for uranium at this utility in 2020 and 2021. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 63 ppb, in 2017, and EPA recorded violations in 2018 and 2019.

What handles it

Copper

Comes from pipes, often your own

Above the action level

1.6ppm

90th percentile, 2025 to 2027

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

Below EPA’s limits1

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.043ppm

Highest yearly average, 2020 to 2025

2025: not found

Averaged by year, the highest was 0.043 ppm, in 2024, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.13 ppm. In 2025, the latest year on file, it wasn’t found in its one sample.

What handles it

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

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

Hardness

Moderately hard, typically 68 mg/L (4 grains per gallon), across 2 sampling points, 2020 to 2024.

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

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2021 to March 31, 202128 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2020 to Dec. 31, 202031 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2020 to Sept. 30, 202031 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2020 to June 30, 202030.3 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2020 to March 31, 202030.8 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2019 to Dec. 31, 201930.5 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2019 to Sept. 30, 201930.4 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2019 to June 30, 201930 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2019 to March 31, 201935 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageOct. 1, 2018 to Dec. 31, 201835.5 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJuly 1, 2018 to Sept. 30, 201837 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageApril 1, 2018 to June 30, 201840 PCI/LResolved
Combined UraniumThe running average was above the legal limit.EPA: Maximum Contaminant Level Violation, AverageJan. 1, 2018 to March 31, 201838 PCI/LResolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 4 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Uranium, fluoride, arsenic, chromium (total), nitrate and total trihalomethanes (TTHM) results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. North Shore MWC’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; California’s results run from Feb. 11, 2020 to June 10, 2026.

Testing your own tap

North Shore MWC’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 North Shore MWC serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Geo-Monitor, Inc

    Hesperia, CA · about 23 miles

    Certified for bacteria

    (760) 244-3481

  • BSK Associates - San Bernardino Analytical Laboratory

    San Bernardino, CA · about 24 miles

    Certified for bacteria

    (559) 497-2888

  • Clinical Laboratory of San Bernardino, Inc.

    Grand Terrace, CA · about 27 miles

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

    (909) 825-7693

All 145 certified labs for California

Sources

PWSID CA3600184. Rebuilt from EPA data on Oct. 18, 2026.

Also in San Bernardino County

All California utilities

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