What was found in ZIP 98178
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 2780 µg/L 28% of the EPA limit 10000 µg/L | 3/4 | SYR4 |
| Nitrate-Nitrite | 2090 µg/L 21% of the EPA limit 10000 µg/L | 2/4 | SYR4 |
| Fluoride | 800 µg/L 20% of the EPA limit 4000 µg/L | 3/4 | SYR4 |
| TTHM | 90.76 µg/L 113% of the EPA limit, in the worst sample — 80 µg/L | 4/4 | SYR4 |
| Chloroform | 87.4 µg/L No EPA limit set | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 85.2 µg/L 142% of the EPA limit, in the worst sample — 60 µg/L | 4/4 | SYR4 |
| Trichloroacetic Acid | 51.2 µg/L No EPA limit set | 4/4 | SYR4 |
| Dichloroacetic Acid | 34 µg/L No EPA limit set | 4/4 | SYR4 |
| Copper | 20 µg/L 1.5% of the EPA limit 1300 µg/L | 2/4 | SYR4 |
| Bromodichloromethane | 10.7 µg/L No EPA limit set | 4/4 | SYR4 |
| Arsenic | 8.1 µg/L 81% of the EPA limit 10 µg/L | 2/4 | SYR4 |
| Barium | 7 µg/L 0.4% of the EPA limit 2000 µg/L | 2/4 | SYR4 |
| Monochloroacetic Acid | 6 µg/L No EPA limit set | 3/4 | SYR4 |
| Dibromochloromethane | 4.8 µg/L No EPA limit set | 4/4 | SYR4 |
| Gross Beta Particle Activity | 2.36 pCi/L No EPA limit set | 1/4 | SYR4 |
| Nitrite | 2 µg/L 0.2% of the EPA limit 1000 µg/L | 1/4 | SYR4 |
| Monobromoacetic Acid | 1.69 µg/L No EPA limit set | 1/4 | SYR4 |
| Dibromoacetic Acid | 1.31 µg/L No EPA limit set | 3/4 | SYR4 |
| Chromium | 1.2 µg/L 1.2% of the EPA limit 100 µg/L | 1/4 | SYR4 |
| Selenium | 1.2 µg/L 2.4% of the EPA limit 50 µg/L | 1/4 | SYR4 |
| Bromoform | 1.04 µg/L No EPA limit set | 2/4 | SYR4 |
| PFBS | 0.0030 µg/L No EPA limit set | 1/4 | UCMR-5 |
| Lead | 0.0019 mg/L 13% of the EPA limit 0.0150 mg/L | 3/4 | 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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 98178
| Supplier | State | Population served |
|---|---|---|
| SEATTLE PUBLIC UTILITIES | WA | 1,161,961 |
| RENTON CITY OF | WA | 108,091 |
| TUKWILA WATER DEPARTMENT | WA | 36,298 |
| SKYWAY WATER & SEWER | WA | 12,036 |
Frequently asked questions about ZIP 98178 tap water
Is the tap water in ZIP 98178 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 98178. 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 98178?
4 public water suppliers report EPA drinking-water monitoring for ZIP 98178. Each is listed above with its population served.
What contaminants are in ZIP 98178's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, TTHM, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.