What was found in ZIP 98501
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 | 2512.5 µg/L 25% of the EPA limit 10000 µg/L Main supplier: OLYMPIA CITY OF · 126,966 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 2415 µg/L 24% of the EPA limit 10000 µg/L Main supplier: OLYMPIA CITY OF · 126,966 people · 2019 | 2/2 | SYR4 |
| Fluoride | 100 µg/L 2.5% of the EPA limit 4000 µg/L Main supplier: OLYMPIA CITY OF · 126,966 people · 2019 | 1/2 | SYR4 |
| Copper | 7 µg/L 0.5% of the EPA limit 1300 µg/L Main supplier: OLYMPIA CITY OF · 126,966 people · 2019
Highest in the ZIP: 11 µg/L — TUMWATER CITY OF · 51,802 people · 2019 | 2/2 | SYR4 |
| TTHM | 9.225 µg/L 12% of the EPA limit 80 µg/L Main supplier: OLYMPIA CITY OF · 126,966 people · 2019 | 2/2 | SYR4 |
| Barium | 8.6 µg/L 0.4% of the EPA limit 2000 µg/L Main supplier: OLYMPIA CITY OF · 126,966 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 1.8 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2019
Highest in the ZIP: 7.9 µg/L — TUMWATER CITY OF · 51,802 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 5.41 µg/L 9% of the EPA limit 60 µg/L Main supplier: OLYMPIA CITY OF · 126,966 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 2.68 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2019
Highest in the ZIP: 5.3 µg/L — TUMWATER CITY OF · 51,802 people · 2019 | 2/2 | SYR4 |
| Chloroform | 4.3 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 3.267 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 2.204 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2019
Highest in the ZIP: 2.8 µg/L — TUMWATER CITY OF · 51,802 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 1.791 pCi/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2019
Highest in the ZIP: 2.73 pCi/L — TUMWATER CITY OF · 51,802 people · 2016 | 2/2 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Main supplier: OLYMPIA CITY OF · 126,966 people · 2019 | 1/2 | SYR4 |
| Bromoform | 0.5850 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2019
Highest in the ZIP: 1.765 µg/L — TUMWATER CITY OF · 51,802 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 1.65 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2019 | 2/2 | SYR4 |
| Xylenes, Total | 0.4000 µg/L 0% of the EPA limit 10000 µg/L Main supplier: OLYMPIA CITY OF · 126,966 people · 2016 | 1/2 | SYR4 |
| Lead | 0.0034 mg/L 23% of the EPA limit 0.0150 mg/L Main supplier: OLYMPIA CITY OF · 126,966 people · 2025
Highest in the ZIP: 0.0080 mg/L — TUMWATER CITY OF · 51,802 people · 2019 | 2/2 | LCR |
| PFBS | 0.0048 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2024
Highest in the ZIP: 0.0068 µg/L — TUMWATER CITY OF · 51,802 people · 2023 | 2/2 | UCMR-5 |
| PFOS | 0.0058 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2024 | 1/2 | UCMR-5 |
| PFOA | 0.0043 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2024 | 1/2 | UCMR-5 |
| Pfhxa | 0.0040 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2024 | 1/2 | UCMR-5 |
| Pfpea | 0.0033 µg/L No EPA limit set Main supplier: OLYMPIA CITY OF · 126,966 people · 2024 | 1/2 | 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 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 98501
| Supplier | State | Population served |
|---|---|---|
| OLYMPIA CITY OF | WA | 126,966 |
| TUMWATER CITY OF | WA | 51,802 |
Frequently asked questions about ZIP 98501 tap water
Is the tap water in ZIP 98501 safe to drink?
EPA testing detected 23 contaminants across the water suppliers serving ZIP 98501. 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 98501?
2 public water suppliers report EPA drinking-water monitoring for ZIP 98501. Each is listed above with its population served.
What contaminants are in ZIP 98501's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Copper, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.