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Tap water quality report

Mason, MI

EPA monitoring detected 2 contaminants across the 2 water suppliers serving Mason. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
8,952
people served
2
contaminants found
Michigan rankings Lead in Michigan PFAS in Michigan

What was found in Mason's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Lithium
15 µg/L
No EPA limit set
Main supplier: MASON, CITY OF · 8,252 people · 2023
1/2 UCMR-5
Lead
0.0017 mg/L 11%
of the EPA limit 0.0150 mg/L
Main supplier: MASON, CITY OF · 8,252 people · 2025
Highest in the city: 0.0020 mg/L — COLUMBIA LAKES ESTATES · 700 people · 2023
2/2 LCR
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 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Mason

SupplierPopulation served
MASON, CITY OF 8,252
COLUMBIA LAKES ESTATES 700

Frequently asked questions about Mason tap water

Is Mason tap water safe to drink?

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

How many water suppliers serve Mason?

2 public water suppliers report drinking-water monitoring for Mason, Michigan to the EPA. Each is listed above with its population served.

What contaminants are in Mason's water?

The contaminants EPA monitoring detected in Mason include Lithium, Lead. The full list, with the level at the main supplier and the data source, is in the table above.

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.