What was found in ZIP 97034
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 | 376.5 µg/L 3.8% of the EPA limit 10000 µg/L Main supplier: PORTLAND WATER BUREAU · 666,200 people · 2019
Highest in the ZIP: 2490 µg/L — RIVERGROVE WATER DISTRICT · 4,000 people · 2019 | 2/4 | SYR4 |
| Nitrate-Nitrite | 324 µg/L 3.2% of the EPA limit 10000 µg/L Main supplier: PORTLAND WATER BUREAU · 666,200 people · 2019
Highest in the ZIP: 2401.5 µg/L — RIVERGROVE WATER DISTRICT · 4,000 people · 2019 | 2/4 | SYR4 |
| Copper | 402 µg/L 31% of the EPA limit 1300 µg/L Main supplier: PORTLAND WATER BUREAU · 666,200 people · 2019
Highest in the ZIP: 778.75 µg/L — RIVERGROVE WATER DISTRICT · 4,000 people · 2019 | 4/4 | SYR4 |
| Fluoride | 175 µg/L 4.4% of the EPA limit 4000 µg/L Main supplier: PORTLAND WATER BUREAU · 666,200 people · 2019 | 1/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 57.1 µg/L 95% of the EPA limit 60 µg/L Main supplier: PORTLAND WATER BUREAU · 666,200 people · 2019 | 4/4 | SYR4 |
| TTHM | 41.075 µg/L 51% of the EPA limit 80 µg/L Main supplier: PORTLAND WATER BUREAU · 666,200 people · 2019
Highest in the ZIP: 44.325 µg/L — WEST LINN, CITY OF · 28,000 people · 2019 | 3/4 | SYR4 |
| Lead | 22.545 µg/L 150% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: PORTLAND WATER BUREAU · 666,200 people · 2019 | 4/4 | SYR4 |
| Barium | 12.1 µg/L 0.6% of the EPA limit 2000 µg/L Main supplier: PORTLAND WATER BUREAU · 666,200 people · 2019 | 1/4 | SYR4 |
| Lithium | 12 µg/L No EPA limit set Highest in the ZIP: RIVERGROVE WATER DISTRICT · 4,000 people · 2025 | 1/4 | UCMR-5 |
| Arsenic | 1.356 µg/L 14% of the EPA limit 10 µg/L Main supplier: PORTLAND WATER BUREAU · 666,200 people · 2019 | 1/4 | SYR4 |
| Bromate | 1.2 µg/L 12% of the EPA limit 10 µg/L Highest in the ZIP: LAKE OSWEGO MUNICIPAL WATER · 40,000 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0049 mg/L 33% of the EPA limit 0.0150 mg/L Main supplier: PORTLAND WATER BUREAU · 666,200 people · 2025 | 4/4 | 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 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 97034
| Supplier | State | Population served |
|---|---|---|
| PORTLAND WATER BUREAU | OR | 666,200 |
| LAKE OSWEGO MUNICIPAL WATER | OR | 40,000 |
| WEST LINN, CITY OF | OR | 28,000 |
| RIVERGROVE WATER DISTRICT | OR | 4,000 |
Frequently asked questions about ZIP 97034 tap water
Is the tap water in ZIP 97034 safe to drink?
EPA testing detected 12 contaminants across the water suppliers serving ZIP 97034. 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 97034?
4 public water suppliers report EPA drinking-water monitoring for ZIP 97034. Each is listed above with its population served.
What contaminants are in ZIP 97034's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Copper, Fluoride, Total Haloacetic Acids (HAA5), and others across this ZIP's suppliers. The full list with levels and sources is above.