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Tap water quality report

Gresham, OR

EPA monitoring detected 5 contaminants across the 3 water suppliers serving Gresham. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

3
water suppliers
76,642
people served
5
contaminants found
Oregon rankings Lead in Oregon PFAS in Oregon

What was found in Gresham's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Copper
941 µg/L 72%
of the EPA limit 1300 µg/L
 3/3 SYR4
Lead
648 µg/L 4320%
of the EPA limit, in the worst sample — 15 µg/L
 3/3 SYR4
Total Haloacetic Acids (HAA5)
66.6 µg/L 111%
of the EPA limit, in the worst sample — 60 µg/L
 3/3 SYR4
TTHM
53.8 µg/L 67%
of the EPA limit 80 µg/L
 3/3 SYR4
Lead
0.0049 mg/L 33%
of the EPA limit 0.0150 mg/L
 3/3 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 single worst sample on record — 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 Gresham

SupplierPopulation served
GRESHAM, CITY OF 73,932
PLEASANT HOME WATER DISTRICT 1,510
LUSTED WATER DISTRICT 1,200

Frequently asked questions about Gresham tap water

Is Gresham tap water safe to drink?

EPA testing detected 5 contaminants in the water serving Gresham. 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 Gresham?

3 public water suppliers report drinking-water monitoring for Gresham, Oregon to the EPA. Each is listed above with its population served.

What contaminants are in Gresham's water?

The contaminants EPA monitoring detected in Gresham include Copper, Lead, Total Haloacetic Acids (HAA5), TTHM, Lead. The full list, with the highest level found 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.