What was found in ZIP 98040
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 | 835 µg/L 8.4% of the EPA limit 10000 µg/L Highest in the ZIP: HAPPY HOLIDAY RV RESORT · 264 people · 2019 | 1/2 | SYR4 |
| Fluoride | 300 µg/L 7.5% of the EPA limit 4000 µg/L Highest in the ZIP: HAPPY HOLIDAY RV RESORT · 264 people · 2013 | 1/2 | SYR4 |
| Barium | 142 µg/L 7.1% of the EPA limit 2000 µg/L Highest in the ZIP: HAPPY HOLIDAY RV RESORT · 264 people · 2013 | 1/2 | SYR4 |
| Copper | 113.89999999999999 µg/L 8.8% of the EPA limit 1300 µg/L Highest in the ZIP: HAPPY HOLIDAY RV RESORT · 264 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 47.95 µg/L 80% of the EPA limit 60 µg/L Main supplier: MERCER ISLAND CITY OF · 31,057 people · 2019 | 1/2 | SYR4 |
| TTHM | 47.8045 µg/L 60% of the EPA limit 80 µg/L Main supplier: MERCER ISLAND CITY OF · 31,057 people · 2019 | 1/2 | SYR4 |
| Chloroform | 45.51 µg/L No EPA limit set Main supplier: MERCER ISLAND CITY OF · 31,057 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 27.255 µg/L No EPA limit set Main supplier: MERCER ISLAND CITY OF · 31,057 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 21.064999999999998 µg/L No EPA limit set Main supplier: MERCER ISLAND CITY OF · 31,057 people · 2019 | 1/2 | SYR4 |
| Lead | 3.899999999999997 µg/L 26% of the EPA limit 15 µg/L Highest in the ZIP: HAPPY HOLIDAY RV RESORT · 264 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 3.1910000000000003 µg/L No EPA limit set Main supplier: MERCER ISLAND CITY OF · 31,057 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 2.595999999999999 µg/L No EPA limit set Main supplier: MERCER ISLAND CITY OF · 31,057 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.36 pCi/L 16% of the EPA limit 15 pCi/L Highest in the ZIP: HAPPY HOLIDAY RV RESORT · 264 people · 2016 | 1/2 | SYR4 |
| Dibromochloromethane | 0.5500 µg/L No EPA limit set Main supplier: MERCER ISLAND CITY OF · 31,057 people · 2019 | 1/2 | SYR4 |
| Bromoform | 0.5000 µg/L No EPA limit set Main supplier: MERCER ISLAND CITY OF · 31,057 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Highest in the ZIP: HAPPY HOLIDAY RV RESORT · 264 people · 2025 | 1/2 | 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 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 98040
| Supplier | State | Population served |
|---|---|---|
| MERCER ISLAND CITY OF | WA | 31,057 |
| HAPPY HOLIDAY RV RESORT | SD | 264 |
Frequently asked questions about ZIP 98040 tap water
Is the tap water in ZIP 98040 safe to drink?
EPA testing detected 16 contaminants across the water suppliers serving ZIP 98040. 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 98040?
2 public water suppliers report EPA drinking-water monitoring for ZIP 98040. Each is listed above with its population served.
What contaminants are in ZIP 98040's water?
EPA monitoring detected Nitrate, Fluoride, Barium, Copper, Total Haloacetic Acids (HAA5), and others across this ZIP's suppliers. The full list with levels and sources is above.