What was found in Spanaway'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.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 3900 µg/L 39% of the EPA limit 10000 µg/L Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019
Highest in the city: 5410 µg/L — WINCHESTER MOBILE HOMES WATER · 350 people · 2019 | 3/6 | SYR4 |
| Nitrate-Nitrite | 3565 µg/L 36% of the EPA limit 10000 µg/L Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019
Highest in the city: 5200 µg/L — WINCHESTER MOBILE HOMES WATER · 350 people · 2012 | 3/6 | SYR4 |
| Fluoride | 280 µg/L 7% of the EPA limit 4000 µg/L Highest in the city: LITTLE CEDAR PARK · 38 people · 2019 | 1/6 | SYR4 |
| Copper | 28 µg/L 2.2% of the EPA limit 1300 µg/L Highest in the city: MCGEE GUEST HOME · 88 people · 2018 | 1/6 | SYR4 |
| TTHM | 8.43 µg/L 11% of the EPA limit 80 µg/L Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019
Highest in the city: 8.81 µg/L — PINEWOOD GLEN MUTUAL WATER ASSN · 70 people · 2017 | 6/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 7.8 µg/L 13% of the EPA limit 60 µg/L Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019 | 3/6 | SYR4 |
| Chloroform | 5.29 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019 | 6/6 | SYR4 |
| Arsenic | 2.04 µg/L 20% of the EPA limit 10 µg/L Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019
Highest in the city: 5 µg/L — PINEWOOD GLEN MUTUAL WATER ASSN · 70 people · 2016 | 3/6 | SYR4 |
| Dichloroacetic Acid | 4.06 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019 | 3/6 | SYR4 |
| Trichloroacetic Acid | 3.845 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019 | 3/6 | SYR4 |
| Lead | 3.4 µg/L 23% of the EPA limit 15 µg/L Highest in the city: MCGEE GUEST HOME · 88 people · 2018 | 1/6 | SYR4 |
| Bromodichloromethane | 2.5 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019
Highest in the city: 3.29 µg/L — PINEWOOD GLEN MUTUAL WATER ASSN · 70 people · 2017 | 6/6 | SYR4 |
| Dibromochloromethane | 1.24 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019
Highest in the city: 2.41 µg/L — PINEWOOD GLEN MUTUAL WATER ASSN · 70 people · 2017 | 6/6 | SYR4 |
| Bromoform | 0.6900 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2019 | 1/6 | SYR4 |
| PFOS | 0.0083 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2025 | 1/6 | UCMR-5 |
| PFBS | 0.0075 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2025 | 1/6 | UCMR-5 |
| PFOA | 0.0062 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2025 | 1/6 | UCMR-5 |
| Pfhxa | 0.0059 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2025 | 1/6 | UCMR-5 |
| Pfpea | 0.0058 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2025 | 1/6 | UCMR-5 |
| PFHXS | 0.0037 µg/L No EPA limit set Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2025 | 1/6 | UCMR-5 |
| Lead | 0.0024 mg/L 16% of the EPA limit 0.0150 mg/L Main supplier: SPANAWAY WATER COMPANY · 34,506 people · 2025 | 6/6 | 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 Spanaway
| Supplier | Population served |
|---|---|
| SPANAWAY WATER COMPANY | 34,506 |
| WINCHESTER MOBILE HOMES WATER | 350 |
| MCGEE GUEST HOME | 88 |
| MARTENS ADD MUTUAL WATER ASSOC | 79 |
| PINEWOOD GLEN MUTUAL WATER ASSN | 70 |
| LITTLE CEDAR PARK | 38 |
Frequently asked questions about Spanaway tap water
Is Spanaway tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Spanaway. 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 Spanaway?
6 public water suppliers report drinking-water monitoring for Spanaway, Washington to the EPA. Each is listed above with its population served.
What contaminants are in Spanaway's water?
The contaminants EPA monitoring detected in Spanaway include Nitrate, Nitrate-Nitrite, Fluoride, 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.