Tap WaterIndex

← Washington

Tap water quality report

Sequim, WA

EPA monitoring detected 27 contaminants across the 37 water suppliers serving Sequim. 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.

37
water suppliers
26,213
people served
27
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Sequim'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
2820 µg/L 28%
of the EPA limit 10000 µg/L
Main supplier: SEQUIM CITY OF · 14,293 people · 2019
Highest in the city: 8990 µg/L — CARLSBORG MOBILE ESTATES · 69 people · 2019
28/37 SYR4
Nitrate-Nitrite
450 µg/L 4.5%
of the EPA limit 10000 µg/L
Main supplier: SEQUIM CITY OF · 14,293 people · 2017
Highest in the city: 7660 µg/L — Parkwood MFD Housing Community · 378 people · 2018
22/37 SYR4
Fluoride
130 µg/L 3.3%
of the EPA limit 4000 µg/L
Main supplier: SEQUIM CITY OF · 14,293 people · 2017
Highest in the city: 400 µg/L — WEST SEQUIM BAY INC · 2,759 people · 2019
6/37 SYR4
Toluene
112.42 µg/L 11%
of the EPA limit 1000 µg/L
Highest in the city: BRANDT POINT · 32 people · 2019
2/37 SYR4
Copper
96 µg/L 7.4%
of the EPA limit 1300 µg/L
Highest in the city: BEACH · 45 people · 2019
5/37 SYR4
TTHM
19.855 µg/L 25%
of the EPA limit 80 µg/L
Main supplier: SEQUIM CITY OF · 14,293 people · 2019
Highest in the city: 31.79 µg/L — BUENA VISTA ESTATES · 42 people · 2017
13/37 SYR4
Barium
20 µg/L 1%
of the EPA limit 2000 µg/L
Highest in the city: BUENA VISTA ESTATES · 42 people · 2017
1/37 SYR4
Chloroform
17.1 µg/L
No EPA limit set
Main supplier: SEQUIM CITY OF · 14,293 people · 2019
Highest in the city: 18.63 µg/L — BUENA VISTA ESTATES · 42 people · 2017
11/37 SYR4
Total Haloacetic Acids (HAA5)
5.78 µg/L 9.6%
of the EPA limit 60 µg/L
Main supplier: SEQUIM CITY OF · 14,293 people · 2019
Highest in the city: 13.06 µg/L — BRANDT POINT · 32 people · 2018
10/37 SYR4
Lead
11 µg/L 73%
of the EPA limit 15 µg/L
Highest in the city: Parkwood MFD Housing Community · 378 people · 2018
11/37 SYR4
Bromodichloromethane
3.58 µg/L
No EPA limit set
Main supplier: SEQUIM CITY OF · 14,293 people · 2019
Highest in the city: 9.87 µg/L — BUENA VISTA ESTATES · 42 people · 2017
10/37 SYR4
Trichloroacetic Acid
4.08 µg/L
No EPA limit set
Main supplier: SEQUIM CITY OF · 14,293 people · 2019
Highest in the city: 6.895 µg/L — BRANDT POINT · 32 people · 2018
6/37 SYR4
Dichloroacetic Acid
2.275 µg/L
No EPA limit set
Main supplier: SEQUIM CITY OF · 14,293 people · 2019
Highest in the city: 6.47 µg/L — BRANDT POINT · 32 people · 2018
8/37 SYR4
Styrene
5.9 µg/L 5.9%
of the EPA limit 100 µg/L
Highest in the city: BRANDT POINT · 32 people · 2019
1/37 SYR4
Arsenic
1.7 µg/L 17%
of the EPA limit 10 µg/L
Main supplier: SEQUIM CITY OF · 14,293 people · 2017
Highest in the city: 5.6 µg/L — PANORAMA VISTA · 75 people · 2016
20/37 SYR4
Dibromochloromethane
1.575 µg/L
No EPA limit set
Main supplier: SEQUIM CITY OF · 14,293 people · 2019
Highest in the city: 5.395 µg/L — DUNGENESS BAY PLAT · 461 people · 2017
10/37 SYR4
Chromium
4 µg/L 4%
of the EPA limit 100 µg/L
Highest in the city: BUENA VISTA ESTATES · 42 people · 2017
1/37 SYR4
Bromoform
3.74 µg/L
No EPA limit set
Highest in the city: HAPPY VALLEY ESTATES · 46 people · 2019
7/37 SYR4
Monochloroacetic Acid
3.49 µg/L
No EPA limit set
Highest in the city: WEST SEQUIM BAY INC · 2,759 people · 2015
1/37 SYR4
Combined Radium (-226 And -228)
3.4 pCi/L 68%
of the EPA limit 5 pCi/L
Highest in the city: MT. VISTA - DUNGENESS GOLF COURSE · 517 people · 2019
2/37 SYR4
Dibromoacetic Acid
1.79 µg/L
No EPA limit set
Highest in the city: HAPPY VALLEY ESTATES · 46 people · 2017
5/37 SYR4
Xylenes, Total
1.08 µg/L 0%
of the EPA limit 10000 µg/L
Highest in the city: BRANDT POINT · 32 people · 2019
1/37 SYR4
Combined Uranium
0.6000 µg/L 2%
of the EPA limit 30 µg/L
Highest in the city: PANORAMA VISTA · 75 people · 2016
1/37 SYR4
Ethylbenzene
0.3905 µg/L 0.1%
of the EPA limit 700 µg/L
Highest in the city: BRANDT POINT · 32 people · 2019
1/37 SYR4
Benzene
0.3000 µg/L 6%
of the EPA limit 5 µg/L
Highest in the city: BRANDT POINT · 32 people · 2019
1/37 SYR4
Lead
0.0021 mg/L 14%
of the EPA limit 0.0150 mg/L
Main supplier: SEQUIM CITY OF · 14,293 people · 2025
Highest in the city: 0.0095 mg/L — Parkwood MFD Housing Community · 378 people · 2025
37/37 LCR
PFBS
0.0058 µg/L
No EPA limit set
Main supplier: SEQUIM CITY OF · 14,293 people · 2023
1/37 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 Sequim

SupplierPopulation served
SEQUIM CITY OF 14,293
WEST SEQUIM BAY INC 2,759
SUNLAND WATER DISTRICT 2,235
ESTATES INC 1,043
Solmar Water 895
MT. VISTA - DUNGENESS GOLF COURSE 517
DUNGENESS MEADOWS 488
MONTERRA 464
DUNGENESS BAY PLAT 461
Parkwood MFD Housing Community 378
MAINS FARM PROPERTY OWNERS 358
SUN MEADOWS 295
VISTAS INC 241
FOUR SEASONS PARK 225
DUNGENESS BEACH 181
FLAURAS ACRES PROPERTYOWNER 150
MAPLE GROVE 132
WOODLAND HEIGHTS 105
JAMESTOWN ON WILCOX LANE 94
BAYWOOD VILLAGE MOBILE HOME PARK 90
HEART O THE HILLS 76
PANORAMA VISTA 75
GREEN ACRES MOBILE HOME PARK 74
CARLSBORG MOBILE ESTATES 69
FOREST RIDGE 65
MEADOWBROOK VILLAGE 55
HAPPY VALLEY ESTATES 46
BEACH 45
BUENA VISTA ESTATES 42
CEDAR GROVE MOBILE PARK 40
ALDERWOOD EAST 39
OLYMPIC VIEW MOBILE PARK 34
OLYMPIC VIEW 33
BRANDT POINT 32
PALO VERDE 30
LOUELLA HEIGHTS 28
PETERSON-WHITTAKER 26

Frequently asked questions about Sequim tap water

Is Sequim tap water safe to drink?

EPA testing detected 27 contaminants in the water serving Sequim. 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 Sequim?

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

What contaminants are in Sequim's water?

The contaminants EPA monitoring detected in Sequim include Nitrate, Nitrate-Nitrite, Fluoride, Toluene, Copper. 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.