What was found in ZIP 98053
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 | 2300 µg/L 23% of the EPA limit 10000 µg/L | 3/4 | SYR4 |
| Nitrate-Nitrite | 1900 µg/L 19% of the EPA limit 10000 µg/L | 3/4 | SYR4 |
| Fluoride | 830 µg/L 21% of the EPA limit 4000 µg/L | 2/4 | SYR4 |
| TTHM | 73.07 µg/L 91% of the EPA limit 80 µg/L | 3/4 | SYR4 |
| Chloroform | 67.7 µg/L No EPA limit set | 3/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 51.08 µg/L 85% of the EPA limit 60 µg/L | 3/4 | SYR4 |
| Copper | 34 µg/L 2.6% of the EPA limit 1300 µg/L | 2/4 | SYR4 |
| Trichloroacetic Acid | 32.7 µg/L No EPA limit set | 3/4 | SYR4 |
| Dichloroacetic Acid | 23.7 µg/L No EPA limit set | 3/4 | SYR4 |
| Lithium | 13 µg/L No EPA limit set | 1/4 | UCMR-5 |
| Bromodichloromethane | 8.27 µg/L No EPA limit set | 3/4 | SYR4 |
| Monochloroacetic Acid | 7.6 µg/L No EPA limit set | 3/4 | SYR4 |
| Arsenic | 6.6 µg/L 66% of the EPA limit 10 µg/L | 3/4 | SYR4 |
| Barium | 5 µg/L 0.3% of the EPA limit 2000 µg/L | 1/4 | SYR4 |
| Dibromochloromethane | 4.42 µg/L No EPA limit set | 3/4 | SYR4 |
| Lead | 4 µg/L 27% of the EPA limit 15 µg/L | 1/4 | SYR4 |
| Chromium | 2 µg/L 2% of the EPA limit 100 µg/L | 1/4 | SYR4 |
| Gross Beta Particle Activity | 1.6 pCi/L No EPA limit set | 1/4 | SYR4 |
| Dibromoacetic Acid | 1.58 µg/L No EPA limit set | 2/4 | SYR4 |
| Bromoform | 1.43 µg/L No EPA limit set | 2/4 | SYR4 |
| Tetrachloroethylene | 1.1 µg/L 22% of the EPA limit 5 µg/L | 1/4 | SYR4 |
| Cadmium | 0.2000 µg/L 4% of the EPA limit 5 µg/L | 1/4 | SYR4 |
| Asbestos | 0.1150 MFL 1.6% of the EPA limit 7 MFL | 1/4 | SYR4 |
| PFHXS | 0.0165 µg/L No EPA limit set | 1/4 | UCMR-5 |
| PFOS | 0.0111 µg/L No EPA limit set | 2/4 | UCMR-5 |
| PFBS | 0.0088 µg/L No EPA limit set | 2/4 | UCMR-5 |
| Lead | 0.0058 mg/L 39% of the EPA limit 0.0150 mg/L | 3/4 | LCR |
| Pfhxa | 0.0043 µg/L No EPA limit set | 1/4 | UCMR-5 |
| Pfpes | 0.0041 µg/L No EPA limit set | 1/4 | UCMR-5 |
| Pfpea | 0.0039 µg/L No EPA limit set | 1/4 | 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 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 98053
| Supplier | State | Population served |
|---|---|---|
| REDMOND WATER SYSTEM CITY OF | WA | 163,335 |
| SAMMAMISH PLATEAU WATER & SEWER | WA | 79,362 |
| WOODINVILLE WATER DISTRICT | WA | 66,699 |
| UNION HILL WATER ASSOCIATION INC | WA | 8,720 |
Frequently asked questions about ZIP 98053 tap water
Is the tap water in ZIP 98053 safe to drink?
EPA testing detected 30 contaminants across the water suppliers serving ZIP 98053. 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 98053?
4 public water suppliers report EPA drinking-water monitoring for ZIP 98053. Each is listed above with its population served.
What contaminants are in ZIP 98053'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.