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Tap water quality report

Montesano, WA

EPA monitoring detected 17 contaminants across the 9 water suppliers serving Montesano. 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.

9
water suppliers
17,032
people served
17
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Montesano'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
Fluoride
1731.5 µg/L 43%
of the EPA limit 4000 µg/L
Main supplier: MONTESANO CITY OF · 6,204 people · 2019
1/9 SYR4
Nitrate
1465 µg/L 15%
of the EPA limit 10000 µg/L
Main supplier: MONTESANO CITY OF · 6,204 people · 2019
6/9 SYR4
Nitrate-Nitrite
1400 µg/L 14%
of the EPA limit 10000 µg/L
Main supplier: MONTESANO CITY OF · 6,204 people · 2019
3/9 SYR4
Copper
50 µg/L 3.8%
of the EPA limit 1300 µg/L
Main supplier: MONTESANO CITY OF · 6,204 people · 2019
Highest in the city: 310 µg/L — GRAYS HARBOR CO WATER DIST 2 · 5,112 people · 2017
2/9 SYR4
TTHM
2.174 µg/L 2.7%
of the EPA limit 80 µg/L
Main supplier: MONTESANO CITY OF · 6,204 people · 2019
Highest in the city: 24.49 µg/L — SEA VIEW · 170 people · 2019
7/9 SYR4
Lead
1.95 µg/L 13%
of the EPA limit 15 µg/L
Main supplier: MONTESANO CITY OF · 6,204 people · 2019
Highest in the city: 13 µg/L — GRAYS HARBOR CO WATER DIST 2 · 5,112 people · 2017
2/9 SYR4
Chloroform
0.4000 µg/L
No EPA limit set
Main supplier: MONTESANO CITY OF · 6,204 people · 2019
Highest in the city: 8.35 µg/L — SEA VIEW · 170 people · 2019
7/9 SYR4
Bromodichloromethane
0.5700 µg/L
No EPA limit set
Main supplier: MONTESANO CITY OF · 6,204 people · 2019
Highest in the city: 8.33 µg/L — SEA VIEW · 170 people · 2019
6/9 SYR4
Total Haloacetic Acids (HAA5)
7.86 µg/L 13%
of the EPA limit 60 µg/L
Highest in the city: SEA VIEW · 170 people · 2019
4/9 SYR4
Dibromochloromethane
0.8610 µg/L
No EPA limit set
Main supplier: MONTESANO CITY OF · 6,204 people · 2019
Highest in the city: 7.484 µg/L — Ocean City · 237 people · 2019
7/9 SYR4
Arsenic
7.24 µg/L 72%
of the EPA limit 10 µg/L
Highest in the city: Ocean City · 237 people · 2019
1/9 SYR4
Bromoform
1.4 µg/L
No EPA limit set
Main supplier: MONTESANO CITY OF · 6,204 people · 2019
Highest in the city: 5.59 µg/L — Ocean City · 237 people · 2019
6/9 SYR4
Trichloroacetic Acid
4.52 µg/L
No EPA limit set
Highest in the city: SEA VIEW · 170 people · 2019
2/9 SYR4
Dichloroacetic Acid
2.24 µg/L
No EPA limit set
Highest in the city: SEA VIEW · 170 people · 2019
3/9 SYR4
Dibromoacetic Acid
2.06 µg/L
No EPA limit set
Highest in the city: Ocean City · 237 people · 2018
3/9 SYR4
Mercury
1 µg/L 50%
of the EPA limit 2 µg/L
Highest in the city: GRAYS HARBOR CO WATER DIST 2 · 5,112 people · 2017
1/9 SYR4
Lead
0.0036 mg/L 24%
of the EPA limit 0.0150 mg/L
Main supplier: MONTESANO CITY OF · 6,204 people · 2025
Highest in the city: 0.0074 mg/L — Ocean City · 237 people · 2025
9/9 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 Montesano

SupplierPopulation served
MONTESANO CITY OF 6,204
GRAYS HARBOR CO WATER DIST 2 5,112
PACIFIC BEACH/MOCLIPS 2,372
Hogans Corner 1,458
ILLAHEE OYEHUT 971
HAVEN BY THE SEA 308
Ocean City 237
MONTE VIEW ESTATES 200
SEA VIEW 170

Frequently asked questions about Montesano tap water

Is Montesano tap water safe to drink?

EPA testing detected 17 contaminants in the water serving Montesano. 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 Montesano?

9 public water suppliers report drinking-water monitoring for Montesano, Washington to the EPA. Each is listed above with its population served.

What contaminants are in Montesano's water?

The contaminants EPA monitoring detected in Montesano include Fluoride, Nitrate, Nitrate-Nitrite, Copper, TTHM. 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.