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Tap water quality report

Coupeville, WA

EPA monitoring detected 40 contaminants across the 92 water suppliers serving Coupeville. 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.

92
water suppliers
20,205
people served
40
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Coupeville'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
Nitrate
1928 µg/L 19%
of the EPA limit 10000 µg/L
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 10100 µg/L — MAPLE HILL PARK · 35 people · 2019
48/92 SYR4
Nitrate-Nitrite
1700 µg/L 17%
of the EPA limit 10000 µg/L
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 8728 µg/L — MAPLE HILL PARK · 35 people · 2019
37/92 SYR4
Fluoride
628 µg/L 16%
of the EPA limit 4000 µg/L
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 970 µg/L — Sky Meadows Community Assoc. · 58 people · 2016
36/92 SYR4
Copper
312 µg/L 24%
of the EPA limit 1300 µg/L
Highest in the city: MECCA COMMUNITY ASSOCIATION · 619 people · 2012
12/92 SYR4
Barium
253 µg/L 13%
of the EPA limit 2000 µg/L
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
15/92 SYR4
TTHM
42.02 µg/L 53%
of the EPA limit 80 µg/L
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 245.77 µg/L — WOODGLEN PRD WATER SYSTEM · 40 people · 2019
59/92 SYR4
Chloroform
3.19 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 171.095 µg/L — WOODGLEN PRD WATER SYSTEM · 40 people · 2019
52/92 SYR4
Total Haloacetic Acids (HAA5)
6.26 µg/L 10%
of the EPA limit 60 µg/L
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 121.2 µg/L — WOODGLEN PRD WATER SYSTEM · 40 people · 2019
54/92 SYR4
Bromoform
18.4 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 111.6 µg/L — SUMMERLAND · 85 people · 2019
49/92 SYR4
Nitrite
100 µg/L 10%
of the EPA limit 1000 µg/L
Highest in the city: CRESCENT ACRES WATER ASSOCIATION · 64 people · 2017
1/92 SYR4
Cyanide
74.7 µg/L 37%
of the EPA limit 200 µg/L
Highest in the city: DAVIS LANDING WATER SYSTEM · 74 people · 2019
1/92 SYR4
Trichloroacetic Acid
70.3 µg/L
No EPA limit set
Highest in the city: WOODGLEN PRD WATER SYSTEM · 40 people · 2019
47/92 SYR4
Lead
1.5 µg/L 10%
of the EPA limit 15 µg/L
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 69 µg/L — MECCA COMMUNITY ASSOCIATION · 619 people · 2012
18/92 SYR4
Bromodichloromethane
8.92 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 61.34 µg/L — WOODGLEN PRD WATER SYSTEM · 40 people · 2019
58/92 SYR4
Dichloroacetic Acid
1.99 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 45.74 µg/L — SIERRA COUNTRY CLUB · 400 people · 2018
33/92 SYR4
Dibromochloromethane
16.675 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 41.485 µg/L — SHIRONA WATER SYSTEM · 243 people · 2019
58/92 SYR4
Monobromoacetic Acid
1.87 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 26.835 µg/L — PINE TERRACE WATER ASSOCIATION · 181 people · 2017
22/92 SYR4
1,1,1-Trichloroethane
24.05 µg/L 12%
of the EPA limit 200 µg/L
Highest in the city: Bets Water System · 50 people · 2019
1/92 SYR4
Arsenic
8.175 µg/L 82%
of the EPA limit 10 µg/L
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 22.5 µg/L — BEACHWOOD WATER COMPANY · 90 people · 2016
71/92 SYR4
Dibromoacetic Acid
4.36 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2019
Highest in the city: 16.45 µg/L — SIERRA COUNTRY CLUB · 400 people · 2018
50/92 SYR4
Chromium
12.4 µg/L 12%
of the EPA limit 100 µg/L
Highest in the city: FAIRWAY ESTATES INC · 100 people · 2019
16/92 SYR4
Gross Beta Particle Activity
9.982 pCi/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2018
19/92 SYR4
Monochloroacetic Acid
9.68 µg/L
No EPA limit set
Highest in the city: SIERRA COUNTRY CLUB · 400 people · 2018
18/92 SYR4
1,1-Dichloroethylene
4 µg/L 57%
of the EPA limit 7 µg/L
Highest in the city: Bets Water System · 50 people · 2019
1/92 SYR4
Selenium
3.4 µg/L 6.8%
of the EPA limit 50 µg/L
Highest in the city: CAMANO HILLS WATER COMPANY INC · 286 people · 2019
6/92 SYR4
Antimony, Total
2 µg/L 33%
of the EPA limit 6 µg/L
Highest in the city: THUNDER RIDGE WATER SYSTEM · 145 people · 2016
1/92 SYR4
Cadmium
1.7 µg/L 34%
of the EPA limit 5 µg/L
Highest in the city: WEST RIDGE WATER SYSTEM · 275 people · 2012
2/92 SYR4
Tetrachloroethylene
0.7900 µg/L 16%
of the EPA limit 5 µg/L
Highest in the city: WILDES GROVE COMMUNITY WATER SYS · 33 people · 2018
2/92 SYR4
Combined Radium (-226 And -228)
0.5000 pCi/L 10%
of the EPA limit 5 pCi/L
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2012
2/92 SYR4
Carbon Tetrachloride
0.3950 µg/L 7.9%
of the EPA limit 5 µg/L
Highest in the city: WOODGLEN PRD WATER SYSTEM · 40 people · 2019
1/92 SYR4
Mercury
0.3700 µg/L 19%
of the EPA limit 2 µg/L
Highest in the city: NORCLIFFE WATER ASSOCIATION · 57 people · 2017
1/92 SYR4
Thallium, Total
0.3000 µg/L 15%
of the EPA limit 2 µg/L
Highest in the city: THUNDER RIDGE WATER SYSTEM · 145 people · 2016
1/92 SYR4
Lead
0.0035 mg/L 23%
of the EPA limit 0.0150 mg/L
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2025
Highest in the city: 0.0489 mg/L — SUNSET DEVELOPMENT COMM CLUB · 92 people · 2025
92/92 LCR
Pfhxa
0.0170 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2025
1/92 UCMR-5
Pfpea
0.0120 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2025
1/92 UCMR-5
PFOA
0.0098 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2025
1/92 UCMR-5
PFBS
0.0067 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2025
1/92 UCMR-5
Pfba
0.0053 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2025
1/92 UCMR-5
PFHXS
0.0038 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2025
1/92 UCMR-5
Pfhpa
0.0033 µg/L
No EPA limit set
Main supplier: COUPEVILLE TOWN OF · 4,142 people · 2025
1/92 UCMR-5
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 Coupeville

The 50 largest of 92 suppliers serving Coupeville, by population served.

SupplierPopulation served
COUPEVILLE TOWN OF 4,142
CAMANO WATER ASSOCIATION 2,592
SCATCHET HEAD WATER DISTRICT 900
CAMALOCH ASSOCIATION 825
NORTHGATE TERRACE COMMUNITY CLUB 750
LOST LAKE PROPERTY OWNERS ASSN 736
MECCA COMMUNITY ASSOCIATION 619
CAMANO VISTA WATER DISTRICT 591
SUNVISTA SUNLIGHT BEACH HOA 500
SARATOGA WATER DISTRICT 477
COMBINED WATER SYSTEM 435
CROSSWOODS WATER SYSTEM 420
WHIDBEY WEST WATER ASSOC. 415
SIERRA COUNTRY CLUB 400
ROCKY POINT COMMUNITY CLUB 320
PARKWOOD MANOR MHP 301
MARINERS COVE BEACH CLUB INC 300
DRIFTWOOD HEIGHTS ASSOCIATION 298
CAMANO HILLS WATER COMPANY INC 286
GOSS LAKE PARK COMMUNITY 285
WEST RIDGE WATER SYSTEM 275
WHIDBEY SHORES WATER SYSTEM 262
SHIRONA WATER SYSTEM 243
HIDE-AWAY WATER COMPANY INC 240
POLNELL SHORES COMM ORG INC 200
COUNTRY PLACE MOBILE HOME PARK 200
PINE TERRACE WATER ASSOCIATION 181
Mutiny Bay Park Water Association 156
LIGHTHOUSE SHORES 152
RHODENA BEACH WATER DISTRICT 152
FIRCREST COMMUNITY WATER SYSTEM 150
POSSESSION SHORES INC 150
SUNLIGHT SHORES COUNTRY CLUB 150
WAGON WHEEL 150
THUNDER RIDGE WATER SYSTEM 145
RACE LAGOON WATER ASSOCIATION 141
VALLEY HIGH PARK 141
RACE LAGOON HEIGHTS ASSOCIATION 141
LAKEVIEW TERRACE 140
LAKE GROVE WATER ASSOCIATION 134
TERONDA WEST COUNTRY CLUB ASSN. 127
Whispering Pines Homeowners Coop 116
ELGERWOOD MAINTENANCE ASSOCIATION 112
BUSH POINT TRAC PARK 111
IDLEWOOD COMMUNITY 111
HOLMES HARBOR WATER CO 110
SKYLINE WEST COMMUNITY CLUB 109
WAYNES RIDGE WATER ASSOC 108
WOODLAND ESTATES 106
FAIRWAY ESTATES INC 100

Frequently asked questions about Coupeville tap water

Is Coupeville tap water safe to drink?

EPA testing detected 40 contaminants in the water serving Coupeville. 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 Coupeville?

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

What contaminants are in Coupeville's water?

The contaminants EPA monitoring detected in Coupeville include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium. 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.