What was found in ZIP 99021
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| 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 ZIP: 6800 µg/L — SPO CO WATER DIST 3 SYS 4 · 6,233 people · 2019 | 3/3 | 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 ZIP: 3784 µg/L — SPO CO WATER DIST 3 SYS 4 · 6,233 people · 2019 | 3/3 | SYR4 |
| Fluoride | 325.85 µg/L 8.1% of the EPA limit 4000 µg/L Highest in the ZIP: WHITWORTH WATER DISTRICT 2 · 26,883 people · 2019 | 2/3 | 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 ZIP: 75.04 µg/L — WHITWORTH WATER DISTRICT 2 · 26,883 people · 2019 | 3/3 | SYR4 |
| Copper | 8.4955 µg/L 0.7% of the EPA limit 1300 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/3 | 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 ZIP: 6.4315 µg/L — SPO CO WATER DIST 3 SYS 4 · 6,233 people · 2016 | 2/3 | SYR4 |
| Arsenic | 4.782 µg/L 48% of the EPA limit 10 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 3/3 | SYR4 |
| Chloroform | 0.8945 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the ZIP: 3.502 µg/L — SPO CO WATER DIST 3 SYS 4 · 6,233 people · 2019 | 2/3 | SYR4 |
| Combined Uranium | 3.1995 µg/L 11% of the EPA limit 30 µg/L Highest in the ZIP: SPO CO WATER DIST 3 SYS 4 · 6,233 people · 2016 | 1/3 | SYR4 |
| Lead | 2.6695 µg/L 18% of the EPA limit 15 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 1/3 | SYR4 |
| Dibromochloromethane | 1.922 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/3 | SYR4 |
| Bromodichloromethane | 1.376 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the ZIP: 1.8925 µg/L — SPO CO WATER DIST 3 SYS 4 · 6,233 people · 2019 | 2/3 | SYR4 |
| Bromoform | 1.6475 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.44 µg/L 2.4% of the EPA limit 60 µg/L Highest in the ZIP: SPO CO WATER DIST 3 SYS 4 · 6,233 people · 2018 | 1/3 | SYR4 |
| Trichloroacetic Acid | 1.44 µg/L No EPA limit set Highest in the ZIP: SPO CO WATER DIST 3 SYS 4 · 6,233 people · 2019 | 1/3 | SYR4 |
| Chromium | 1.3085 µg/L 1.3% of the EPA limit 100 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/3 | SYR4 |
| Selenium | 1.15 µg/L 2.3% of the EPA limit 50 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 1/3 | SYR4 |
| Trichloroethylene | 0.6980 µg/L 14% of the EPA limit 5 µg/L Highest in the ZIP: WHITWORTH WATER DISTRICT 2 · 26,883 people · 2019 | 1/3 | SYR4 |
| Mercury | 0.2190 µg/L 11% of the EPA limit 2 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 1/3 | SYR4 |
| PFOS | 0.0061 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025 | 2/3 | UCMR-5 |
| PFBS | 0.0039 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025
Highest in the ZIP: 0.0052 µg/L — WHITWORTH WATER DISTRICT 2 · 26,883 people · 2024 | 2/3 | UCMR-5 |
| Pfhxa | 0.0035 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025 | 2/3 | UCMR-5 |
| Pfpea | 0.0033 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025
Highest in the ZIP: 0.0035 µg/L — WHITWORTH WATER DISTRICT 2 · 26,883 people · 2024 | 2/3 | UCMR-5 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2024 | 3/3 | 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.
Water suppliers serving ZIP 99021
| Supplier | State | Population served |
|---|---|---|
| SPOKANE CITY OF | WA | 346,138 |
| WHITWORTH WATER DISTRICT 2 | WA | 26,883 |
| SPO CO WATER DIST 3 SYS 4 | WA | 6,233 |
Frequently asked questions about ZIP 99021 tap water
Is the tap water in ZIP 99021 safe to drink?
EPA testing detected 24 contaminants across the water suppliers serving ZIP 99021. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 99021?
3 public water suppliers report EPA drinking-water monitoring for ZIP 99021. Each is listed above with its population served.
What contaminants are in ZIP 99021's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Barium, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.