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Tap water quality report

Bothell, WA

EPA monitoring detected 10 contaminants across the 2 water suppliers serving Bothell. 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
65,490
people served
10
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Bothell'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
TTHM
57.3 µg/L 72%
of the EPA limit 80 µg/L
Main supplier: SILVER LAKE WATER & SEWER DISTRICT · 65,033 people · 2019
2/2 SYR4
Chloroform
54.8 µg/L
No EPA limit set
Main supplier: SILVER LAKE WATER & SEWER DISTRICT · 65,033 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
39.08 µg/L 65%
of the EPA limit 60 µg/L
Main supplier: SILVER LAKE WATER & SEWER DISTRICT · 65,033 people · 2019
Highest in the city: 47.31 µg/L — WANDERING CREEK HOMEOWNERS ASSOC · 457 people · 2019
2/2 SYR4
Trichloroacetic Acid
25.555 µg/L
No EPA limit set
Main supplier: SILVER LAKE WATER & SEWER DISTRICT · 65,033 people · 2019
Highest in the city: 36.79 µg/L — WANDERING CREEK HOMEOWNERS ASSOC · 457 people · 2019
2/2 SYR4
Dichloroacetic Acid
16.15 µg/L
No EPA limit set
Main supplier: SILVER LAKE WATER & SEWER DISTRICT · 65,033 people · 2019
2/2 SYR4
Monochloroacetic Acid
3.33 µg/L
No EPA limit set
Main supplier: SILVER LAKE WATER & SEWER DISTRICT · 65,033 people · 2019
2/2 SYR4
Bromodichloromethane
2.5 µg/L
No EPA limit set
Main supplier: SILVER LAKE WATER & SEWER DISTRICT · 65,033 people · 2019
Highest in the city: 2.5845 µg/L — WANDERING CREEK HOMEOWNERS ASSOC · 457 people · 2019
2/2 SYR4
Monobromoacetic Acid
2.3 µg/L
No EPA limit set
Highest in the city: WANDERING CREEK HOMEOWNERS ASSOC · 457 people · 2019
1/2 SYR4
Dibromoacetic Acid
1.01 µg/L
No EPA limit set
Highest in the city: WANDERING CREEK HOMEOWNERS ASSOC · 457 people · 2019
1/2 SYR4
Dibromochloromethane
0.2700 µg/L
No EPA limit set
Highest in the city: WANDERING CREEK HOMEOWNERS ASSOC · 457 people · 2019
1/2 SYR4
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 Bothell

SupplierPopulation served
SILVER LAKE WATER & SEWER DISTRICT 65,033
WANDERING CREEK HOMEOWNERS ASSOC 457

Frequently asked questions about Bothell tap water

Is Bothell tap water safe to drink?

EPA testing detected 10 contaminants in the water serving Bothell. 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 Bothell?

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

What contaminants are in Bothell's water?

The contaminants EPA monitoring detected in Bothell include TTHM, Chloroform, Total Haloacetic Acids (HAA5), Trichloroacetic Acid, Dichloroacetic Acid. 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.