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Tap water quality report

Mason, City of

EPA monitoring tested this supplier for 31 contaminants and detected 2. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

31
contaminants tested
2
detected
8,252
people served
27
health-based violations
Michigan rankingsLead in MichiganPFAS in Michigan
Water source
Ground water
Ownership
Local government
Counties served
Ingham

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

27
health-based violations
50
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2005-01-04 → 2009-01-13
MCL Health-based Resolved 2005-01-04 → 2009-01-13
MCL Health-based Resolved 2005-01-04 → 2009-01-13
MCL Health-based Resolved 2005-01-04 → 2009-01-13
MCL Health-based Resolved 2005-01-04 → 2009-01-13
MCL Health-based Resolved 2005-01-04 → 2009-01-13
MCL Health-based Resolved 2005-01-04 → 2009-01-13
MCL Health-based Resolved 2005-01-04 → 2009-01-13
MCL Health-based Resolved 2005-01-04 → 2009-01-13
MCL Health-based Resolved 2005-01-04 → 2009-01-13

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Lead
0.0017 mg/L 11%
of the EPA limit 0.0150 mg/L
 45/45 LCR 2025
Lithium
15 µg/L
No EPA limit set
 2/4 UCMR-5 2023
29 contaminants tested, none detected
11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaHfpo-DaNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfuna

Utility contact

Contact
REWERTS, JEFF
Phone
517-290-5681
Email
jeffr@mason.mi.us

Frequently asked questions about Mason, City of

Is Mason, City of tap water safe to drink?

EPA monitoring detected 2 contaminants in Mason, City of's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Mason, City of's water?

EPA monitoring detected Lead, Lithium. The full list with the level and data source for each is above.

How many people does Mason, City of serve?

Mason, City of reports serving 8,252 people in Michigan, per its EPA record.

Has Mason, City of had any water quality violations?

The EPA has 50 violations on file for Mason, City of, of which 27 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.