What was found in ZIP 99004
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 | 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 | 3/3 | SYR4 |
| Fluoride | 1081.75 µg/L 27% of the EPA limit 4000 µg/L Highest in the ZIP: CHENEY CITY OF · 16,954 people · 2019 | 2/3 | SYR4 |
| Copper | 8.4955 µg/L 0.7% of the EPA limit 1300 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the ZIP: 268.088 µg/L — CHENEY CITY OF · 16,954 people · 2019 | 3/3 | 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: 67.335 µg/L — EASTERN WASHINGTON UNIVERSITY · 17,108 people · 2018 | 3/3 | SYR4 |
| Lithium | 20.5 µg/L No EPA limit set Highest in the ZIP: EASTERN WASHINGTON UNIVERSITY · 17,108 people · 2025 | 2/3 | UCMR-5 |
| 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: 19.086 µg/L — EASTERN WASHINGTON UNIVERSITY · 17,108 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: 11.4 µg/L — CHENEY CITY OF · 16,954 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 1.376 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the ZIP: 6.5735 µg/L — EASTERN WASHINGTON UNIVERSITY · 17,108 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5.92 µg/L 9.9% of the EPA limit 60 µg/L Highest in the ZIP: CHENEY CITY OF · 16,954 people · 2018 | 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 |
| Dibromochloromethane | 1.922 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the ZIP: 4.46 µg/L — EASTERN WASHINGTON UNIVERSITY · 17,108 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 4.1 µg/L No EPA limit set Highest in the ZIP: CHENEY CITY OF · 16,954 people · 2019 | 2/3 | SYR4 |
| Combined Radium (-226 And -228) | 3.173 pCi/L 63% of the EPA limit 5 pCi/L Highest in the ZIP: CHENEY CITY OF · 16,954 people · 2015 | 1/3 | SYR4 |
| Dichloroacetic Acid | 2.685 µg/L No EPA limit set Highest in the ZIP: CHENEY CITY OF · 16,954 people · 2019 | 2/3 | SYR4 |
| Lead | 2.6695 µg/L 18% of the EPA limit 15 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/3 | SYR4 |
| Cyanide | 2.5 µg/L 1.3% of the EPA limit 200 µg/L Highest in the ZIP: CHENEY CITY OF · 16,954 people · 2019 | 1/3 | SYR4 |
| Bromoform | 1.6475 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the ZIP: 1.835 µg/L — CHENEY CITY OF · 16,954 people · 2019 | 3/3 | SYR4 |
| Chromium | 1.3085 µg/L 1.3% of the EPA limit 100 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 1/3 | SYR4 |
| Selenium | 1.15 µg/L 2.3% of the EPA limit 50 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 0.6770 µg/L No EPA limit set Highest in the ZIP: CHENEY CITY OF · 16,954 people · 2019 | 1/3 | SYR4 |
| Antimony, Total | 0.4000 µg/L 6.7% of the EPA limit 6 µg/L Highest in the ZIP: CHENEY CITY OF · 16,954 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 |
| Beryllium, Total | 0.2000 µg/L 5% of the EPA limit 4 µg/L Highest in the ZIP: CHENEY CITY OF · 16,954 people · 2019 | 1/3 | SYR4 |
| Thallium, Total | 0.1000 µg/L 5% of the EPA limit 2 µg/L Highest in the ZIP: CHENEY CITY OF · 16,954 people · 2019 | 1/3 | 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 ZIP: 0.0065 mg/L — EASTERN WASHINGTON UNIVERSITY · 17,108 people · 2023 | 3/3 | LCR |
| PFOS | 0.0061 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025 | 1/3 | UCMR-5 |
| PFBS | 0.0039 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025 | 1/3 | UCMR-5 |
| Pfhxa | 0.0035 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025 | 1/3 | UCMR-5 |
| Pfpea | 0.0033 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025 | 1/3 | 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.
Water suppliers serving ZIP 99004
| Supplier | State | Population served |
|---|---|---|
| SPOKANE CITY OF | WA | 346,138 |
| EASTERN WASHINGTON UNIVERSITY | WA | 17,108 |
| CHENEY CITY OF | WA | 16,954 |
Frequently asked questions about ZIP 99004 tap water
Is the tap water in ZIP 99004 safe to drink?
EPA testing detected 30 contaminants across the water suppliers serving ZIP 99004. 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 99004?
3 public water suppliers report EPA drinking-water monitoring for ZIP 99004. Each is listed above with its population served.
What contaminants are in ZIP 99004's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.