What was found in ZIP 99001
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: 4075 µg/L — AIRWAY HEIGHTS CITY OF · 9,489 people · 2019 | 2/2 | 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: 2672 µg/L — AIRWAY HEIGHTS CITY OF · 9,489 people · 2016 | 2/2 | SYR4 |
| Fluoride | 330.9 µg/L 8.3% of the EPA limit 4000 µg/L Highest in the ZIP: AIRWAY HEIGHTS CITY OF · 9,489 people · 2016 | 1/2 | 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: 49.68 µg/L — AIRWAY HEIGHTS CITY OF · 9,489 people · 2016 | 2/2 | 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: 13.9 µg/L — AIRWAY HEIGHTS CITY OF · 9,489 people · 2016 | 2/2 | 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: 9.8525 µg/L — AIRWAY HEIGHTS CITY OF · 9,489 people · 2019 | 2/2 | SYR4 |
| Chloroform | 0.8945 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the ZIP: 8.46 µg/L — AIRWAY HEIGHTS CITY OF · 9,489 people · 2019 | 2/2 | SYR4 |
| Arsenic | 4.782 µg/L 48% of the EPA limit 10 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/2 | SYR4 |
| Lead | 2.6695 µg/L 18% of the EPA limit 15 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 1.922 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/2 | SYR4 |
| Bromoform | 1.6475 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 1.376 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2019
Highest in the ZIP: 1.647 µg/L — AIRWAY HEIGHTS CITY OF · 9,489 people · 2019 | 2/2 | SYR4 |
| Chromium | 1.3085 µg/L 1.3% of the EPA limit 100 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 2/2 | SYR4 |
| Selenium | 1.15 µg/L 2.3% of the EPA limit 50 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 1/2 | SYR4 |
| Trichloroethylene | 0.9600 µg/L 19% of the EPA limit 5 µg/L Highest in the ZIP: AIRWAY HEIGHTS CITY OF · 9,489 people · 2019 | 1/2 | SYR4 |
| Mercury | 0.2190 µg/L 11% of the EPA limit 2 µg/L Main supplier: SPOKANE CITY OF · 346,138 people · 2019 | 1/2 | SYR4 |
| Pfpea | 0.0033 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025
Highest in the ZIP: 0.1393 µg/L — AIRWAY HEIGHTS CITY OF · 9,489 people · 2025 | 2/2 | UCMR-5 |
| Pfba | 0.0792 µg/L No EPA limit set Highest in the ZIP: AIRWAY HEIGHTS CITY OF · 9,489 people · 2025 | 1/2 | UCMR-5 |
| Pfhxa | 0.0035 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025
Highest in the ZIP: 0.0237 µg/L — AIRWAY HEIGHTS CITY OF · 9,489 people · 2025 | 2/2 | 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
Highest in the ZIP: 0.0111 mg/L — AIRWAY HEIGHTS CITY OF · 9,489 people · 2025 | 2/2 | LCR |
| PFOS | 0.0061 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025 | 1/2 | UCMR-5 |
| PFBS | 0.0039 µg/L No EPA limit set Main supplier: SPOKANE CITY OF · 346,138 people · 2025 | 1/2 | UCMR-5 |
| PFHXS | 0.0032 µg/L No EPA limit set Highest in the ZIP: AIRWAY HEIGHTS CITY OF · 9,489 people · 2025 | 1/2 | 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 99001
| Supplier | State | Population served |
|---|---|---|
| SPOKANE CITY OF | WA | 346,138 |
| AIRWAY HEIGHTS CITY OF | WA | 9,489 |
Frequently asked questions about ZIP 99001 tap water
Is the tap water in ZIP 99001 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 99001. 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 99001?
2 public water suppliers report EPA drinking-water monitoring for ZIP 99001. Each is listed above with its population served.
What contaminants are in ZIP 99001'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.