What was found in ZIP 98027
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 |
|---|---|---|---|
| Fluoride | 910 µg/L 23% of the EPA limit 4000 µg/L | 1/2 | SYR4 |
| Nitrate | 660 µg/L 6.6% of the EPA limit 10000 µg/L | 1/2 | SYR4 |
| Nitrate-Nitrite | 540 µg/L 5.4% of the EPA limit 10000 µg/L | 1/2 | SYR4 |
| TTHM | 63.3 µg/L 79% of the EPA limit 80 µg/L | 2/2 | SYR4 |
| Chloroform | 59.5 µg/L No EPA limit set | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 56.6 µg/L 94% of the EPA limit 60 µg/L | 2/2 | SYR4 |
| Trichloroacetic Acid | 28.7 µg/L No EPA limit set | 2/2 | SYR4 |
| Dichloroacetic Acid | 24 µg/L No EPA limit set | 2/2 | SYR4 |
| Barium | 13 µg/L 0.7% of the EPA limit 2000 µg/L | 1/2 | SYR4 |
| Arsenic | 9 µg/L 90% of the EPA limit 10 µg/L | 2/2 | SYR4 |
| Copper | 5 µg/L 0.4% of the EPA limit 1300 µg/L | 1/2 | SYR4 |
| Bromodichloromethane | 4.11 µg/L No EPA limit set | 2/2 | SYR4 |
| Monochloroacetic Acid | 4 µg/L No EPA limit set | 2/2 | SYR4 |
| Dibromochloromethane | 2.6 µg/L No EPA limit set | 2/2 | SYR4 |
| Dibromoacetic Acid | 1.05 µg/L No EPA limit set | 1/2 | SYR4 |
| Bromoform | 0.5000 µg/L No EPA limit set | 1/2 | SYR4 |
| Lead | 0.0012 mg/L 8% of the EPA limit 0.0150 mg/L | 2/2 | 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 98027
| Supplier | State | Population served |
|---|---|---|
| ISSAQUAH WATER SYSTEM | WA | 43,584 |
| KING COUNTY WATER DISTRICT NO 90 | WA | 20,100 |
Frequently asked questions about ZIP 98027 tap water
Is the tap water in ZIP 98027 safe to drink?
EPA testing detected 17 contaminants across the water suppliers serving ZIP 98027. 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 98027?
2 public water suppliers report EPA drinking-water monitoring for ZIP 98027. Each is listed above with its population served.
What contaminants are in ZIP 98027's water?
EPA monitoring detected Fluoride, Nitrate, Nitrate-Nitrite, TTHM, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.