What was found in ZIP 99164
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 |
|---|---|---|---|
| Fluoride | 515.65 µg/L 13% of the EPA limit 4000 µg/L Main supplier: WASHINGTON STATE UNIVERSITY · 21,506 people · 2018 | 1/1 | SYR4 |
| Barium | 108.955 µg/L 5.4% of the EPA limit 2000 µg/L Main supplier: WASHINGTON STATE UNIVERSITY · 21,506 people · 2018 | 1/1 | SYR4 |
| Lithium | 16.6 µg/L No EPA limit set Main supplier: WASHINGTON STATE UNIVERSITY · 21,506 people · 2025 | 1/1 | UCMR-5 |
| Copper | 3.44 µg/L 0.3% of the EPA limit 1300 µg/L Main supplier: WASHINGTON STATE UNIVERSITY · 21,506 people · 2018 | 1/1 | SYR4 |
| Chloroform | 1.078 µg/L No EPA limit set Main supplier: WASHINGTON STATE UNIVERSITY · 21,506 people · 2019 | 1/1 | SYR4 |
| TTHM | 1.078 µg/L 1.3% of the EPA limit 80 µg/L Main supplier: WASHINGTON STATE UNIVERSITY · 21,506 people · 2012 | 1/1 | SYR4 |
| Lead | 0.0049 mg/L 33% of the EPA limit 0.0150 mg/L Main supplier: WASHINGTON STATE UNIVERSITY · 21,506 people · 2024 | 1/1 | 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 99164
| Supplier | State | Population served |
|---|---|---|
| WASHINGTON STATE UNIVERSITY | WA | 21,506 |
Frequently asked questions about ZIP 99164 tap water
Is the tap water in ZIP 99164 safe to drink?
EPA testing detected 7 contaminants across the water suppliers serving ZIP 99164. 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 99164?
1 public water supplier report EPA drinking-water monitoring for ZIP 99164. Each is listed above with its population served.
What contaminants are in ZIP 99164's water?
EPA monitoring detected Fluoride, Barium, Lithium, Copper, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.