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Tap water quality report

Spokane, WA

EPA monitoring detected 30 contaminants across the 32 water suppliers serving Spokane. 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.

32
water suppliers
429,723
people served
30
contaminants found
Washington rankings Lead in Washington PFAS in Washington

What was found in Spokane'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
3327.5 µg/L 33%
of the EPA limit 10000 µg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 8747.5 µg/L — MOUNT ST MICHAELS SCHOOL & CHURCH · 162 people · 2019
27/32 SYR4
Nitrate-Nitrite
2553 µg/L 26%
of the EPA limit 10000 µg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 7099.5 µg/L — INDIAN VILLAGE ESTATES WATER ASSN · 90 people · 2016
25/32 SYR4
Fluoride
405 µg/L 10%
of the EPA limit 4000 µg/L
Highest in the city: RIDGEVIEW PARK ESTATES · 30 people · 2018
10/32 SYR4
Copper
8.4955 µg/L 0.7%
of the EPA limit 1300 µg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 389.65 µg/L — INDIAN VILLAGE ESTATES WATER ASSN · 90 people · 2016
19/32 SYR4
Barium
48.43 µg/L 2.4%
of the EPA limit 2000 µg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 141.95 µg/L — MOUNT ST MICHAELS SCHOOL & CHURCH · 162 people · 2013
26/32 SYR4
Lead
2.6695 µg/L 18%
of the EPA limit 15 µg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 29.9 µg/L — MULLEN HILL TERRACE MHP · 207 people · 2018
7/32 SYR4
TTHM
4.816 µg/L 6%
of the EPA limit 80 µg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 16.742 µg/L — INDIAN VILLAGE ESTATES WATER ASSN · 90 people · 2018
16/32 SYR4
Lithium
12 µg/L
No EPA limit set
Highest in the city: SPO CO WATER DIST 3 SYS 1 · 19,035 people · 2023
2/32 UCMR-5
Arsenic
4.782 µg/L 48%
of the EPA limit 10 µg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 8.333 µg/L — CHATTAROY VALLEY MOBILE ESTATES · 333 people · 2019
26/32 SYR4
Chloroform
0.8945 µg/L
No EPA limit set
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 7.663 µg/L — INDIAN VILLAGE ESTATES WATER ASSN · 90 people · 2019
13/32 SYR4
Total Haloacetic Acids (HAA5)
7.2345 µg/L 12%
of the EPA limit 60 µg/L
Highest in the city: SPO CO WATER DIST 3 SYS 1 · 19,035 people · 2018
6/32 SYR4
Bromodichloromethane
1.376 µg/L
No EPA limit set
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 6.582 µg/L — INDIAN VILLAGE ESTATES WATER ASSN · 90 people · 2019
13/32 SYR4
Dichloroacetic Acid
5.9725 µg/L
No EPA limit set
Highest in the city: SPO CO WATER DIST 3 SYS 1 · 19,035 people · 2019
3/32 SYR4
Chromium
1.3085 µg/L 1.3%
of the EPA limit 100 µg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 3.6 µg/L — TRENTWOOD IRRIGATION DISTRICT 3 · 4,228 people · 2014
4/32 SYR4
Dibromochloromethane
1.922 µg/L
No EPA limit set
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 3.453 µg/L — INDIAN VILLAGE ESTATES WATER ASSN · 90 people · 2019
12/32 SYR4
Combined Uranium
3.1995 µg/L 11%
of the EPA limit 30 µg/L
Highest in the city: SPO CO WATER DIST 3 SYS 4 · 6,233 people · 2016
2/32 SYR4
Di(2-ethylhexyl) Phthalate
2.953 µg/L 49%
of the EPA limit 6 µg/L
Highest in the city: CHATTAROY VALLEY MOBILE ESTATES · 333 people · 2019
2/32 SYR4
Bromoform
1.6475 µg/L
No EPA limit set
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the city: 2.27 µg/L — INDIAN VILLAGE ESTATES WATER ASSN · 90 people · 2019
13/32 SYR4
Combined Radium (-226 And -228)
2.1515 pCi/L 43%
of the EPA limit 5 pCi/L
Highest in the city: SPO CO WATER DIST 3 SYS 3 · 3,768 people · 2016
1/32 SYR4
Trichloroacetic Acid
2.096 µg/L
No EPA limit set
Highest in the city: INDIAN VILLAGE ESTATES WATER ASSN · 90 people · 2018
4/32 SYR4
Dibromoacetic Acid
1.346 µg/L
No EPA limit set
Highest in the city: SPO CO WATER DIST 3 SYS 1 · 19,035 people · 2019
4/32 SYR4
Selenium
1.15 µg/L 2.3%
of the EPA limit 50 µg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
1/32 SYR4
Trichloroethylene
1.037 µg/L 21%
of the EPA limit 5 µg/L
Highest in the city: WEST PRAIRIE VILLAGE · 375 people · 2019
2/32 SYR4
Mercury
0.2190 µg/L 11%
of the EPA limit 2 µg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2019
1/32 SYR4
Lead
0.0020 mg/L 13%
of the EPA limit 0.0150 mg/L
Main supplier: SPOKANE CITY OF · 346,138 people · 2024
Highest in the city: 0.0125 mg/L — SHADY PINES TRAILER COURT · 70 people · 2001
32/32 LCR
PFOS
0.0061 µg/L
No EPA limit set
Main supplier: SPOKANE CITY OF · 346,138 people · 2025
Highest in the city: 0.0120 µg/L — TRENTWOOD IRRIGATION DISTRICT 3 · 4,228 people · 2024
2/32 UCMR-5
Pfpea
0.0033 µg/L
No EPA limit set
Main supplier: SPOKANE CITY OF · 346,138 people · 2025
Highest in the city: 0.0058 µg/L — MODEL IRRIGATION DIST #18 · 7,903 people · 2025
4/32 UCMR-5
PFOA
0.0051 µg/L
No EPA limit set
Highest in the city: TRENTWOOD IRRIGATION DISTRICT 3 · 4,228 people · 2024
2/32 UCMR-5
PFBS
0.0039 µg/L
No EPA limit set
Main supplier: SPOKANE CITY OF · 346,138 people · 2025
Highest in the city: 0.0049 µg/L — TRENTWOOD IRRIGATION DISTRICT 3 · 4,228 people · 2024
3/32 UCMR-5
Pfhxa
0.0035 µg/L
No EPA limit set
Main supplier: SPOKANE CITY OF · 346,138 people · 2025
Highest in the city: 0.0040 µg/L — TRENTWOOD IRRIGATION DISTRICT 3 · 4,228 people · 2024
3/32 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 Spokane

SupplierPopulation served
SPOKANE CITY OF 346,138
SPO CO WATER DIST 3 SYS 1 19,035
MODERN ELECTRIC WATER CO 18,487
MODEL IRRIGATION DIST #18 7,903
PASADENA PARK IRR DIST 17 6,269
SPO CO WATER DIST 3 SYS 4 6,233
ORCHARD AVENUE IRRIGATION DIST 6 4,330
TRENTWOOD IRRIGATION DISTRICT 3 4,228
IRVIN WATER DISTRICT #6 4,150
SPO CO WATER DIST 3 SYS 3 3,768
North Spokane Irrigation District 8 2,214
MILLWOOD CITY OF 1,925
WHITWORTH UNIVERSITY 1,200
RIDGE WATER ASSOCIATION 615
SPO CO WATER DIST 3 SYS 5 485
SPO CO WATER DIST 3 SYS 8 375
WEST PRAIRIE VILLAGE 375
SPO CO WATER DIST 3 SYS 6 358
CHATTAROY VALLEY MOBILE ESTATES 333
River Bluff Water System 330
MULLEN HILL TERRACE MHP 207
MOUNT ST MICHAELS SCHOOL & CHURCH 162
SPO CO WATER DIST 3 SYS 9 105
PINE ACRES MOBILE HOME PARK 100
INDIAN VILLAGE ESTATES WATER ASSN 90
SHADY PINES TRAILER COURT 70
TEEN CHALLENGE 61
RIVERVALE WATER ASSN 48
HIDDEN HILLS ESTATES 39
WOODLAND PARK TRAILER COURT 38
RIDGEVIEW PARK ESTATES 30
PATTERSON ADDITION 22

Frequently asked questions about Spokane tap water

Is Spokane tap water safe to drink?

EPA testing detected 30 contaminants in the water serving Spokane. 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 Spokane?

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

What contaminants are in Spokane's water?

The contaminants EPA monitoring detected in Spokane 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.