What was found in Monroe's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 2200 µg/L 22% of the EPA limit 10000 µg/L Highest in the city: Peoples Creek Water System · 76 people · 2019 | 4/9 | SYR4 |
| Nitrate-Nitrite | 1596 µg/L 16% of the EPA limit 10000 µg/L Highest in the city: Peoples Creek Water System · 76 people · 2018 | 4/9 | SYR4 |
| Fluoride | 507.5 µg/L 13% of the EPA limit 4000 µg/L Highest in the city: Peoples Creek Water System · 76 people · 2018 | 2/9 | SYR4 |
| Nitrite | 171.15 µg/L 17% of the EPA limit 1000 µg/L Highest in the city: Peoples Creek Water System · 76 people · 2018 | 1/9 | SYR4 |
| Total Haloacetic Acids (HAA5) | 41.65 µg/L 69% of the EPA limit 60 µg/L Main supplier: MONROE WATER SYSTEM · 23,467 people · 2019
Highest in the city: 90.414 µg/L — THUNDERBIRD TERRACE WATER SYSTEM · 75 people · 2019 | 6/9 | SYR4 |
| TTHM | 64.9 µg/L 81% of the EPA limit 80 µg/L Main supplier: MONROE WATER SYSTEM · 23,467 people · 2019 | 6/9 | SYR4 |
| Chloroform | 62.1 µg/L No EPA limit set Main supplier: MONROE WATER SYSTEM · 23,467 people · 2019 | 6/9 | SYR4 |
| Trichloroacetic Acid | 24.38 µg/L No EPA limit set Main supplier: MONROE WATER SYSTEM · 23,467 people · 2019
Highest in the city: 61.84 µg/L — THUNDERBIRD TERRACE WATER SYSTEM · 75 people · 2019 | 6/9 | SYR4 |
| Barium | 58.92 µg/L 2.9% of the EPA limit 2000 µg/L Highest in the city: Peoples Creek Water System · 76 people · 2018 | 2/9 | SYR4 |
| Dichloroacetic Acid | 17.55 µg/L No EPA limit set Main supplier: MONROE WATER SYSTEM · 23,467 people · 2019
Highest in the city: 31.4 µg/L — THUNDERBIRD TERRACE WATER SYSTEM · 75 people · 2019 | 6/9 | SYR4 |
| Bromoform | 30.275 µg/L No EPA limit set Highest in the city: Peoples Creek Water System · 76 people · 2017 | 2/9 | SYR4 |
| Copper | 13.2 µg/L 1% of the EPA limit 1300 µg/L Highest in the city: Peoples Creek Water System · 76 people · 2018 | 2/9 | SYR4 |
| Dibromochloromethane | 10.25 µg/L No EPA limit set Highest in the city: Peoples Creek Water System · 76 people · 2017 | 2/9 | SYR4 |
| Lead | 10 µg/L 67% of the EPA limit 15 µg/L Highest in the city: SEVENTH HEAVEN COUNTRY CLUB · 48 people · 2017 | 3/9 | SYR4 |
| Monochloroacetic Acid | 3.35 µg/L No EPA limit set Main supplier: MONROE WATER SYSTEM · 23,467 people · 2019
Highest in the city: 7.2 µg/L — THUNDERBIRD TERRACE WATER SYSTEM · 75 people · 2019 | 5/9 | SYR4 |
| Bromodichloromethane | 2.7 µg/L No EPA limit set Main supplier: MONROE WATER SYSTEM · 23,467 people · 2019
Highest in the city: 4.086 µg/L — THUNDERBIRD TERRACE WATER SYSTEM · 75 people · 2019 | 6/9 | SYR4 |
| Arsenic | 3.1 µg/L 31% of the EPA limit 10 µg/L Highest in the city: SEVENTH HEAVEN COUNTRY CLUB · 48 people · 2017 | 3/9 | SYR4 |
| Monobromoacetic Acid | 2.8875 µg/L No EPA limit set Highest in the city: THUNDERBIRD TERRACE WATER SYSTEM · 75 people · 2019 | 1/9 | SYR4 |
| Dibromoacetic Acid | 2.272 µg/L No EPA limit set Highest in the city: THUNDERBIRD TERRACE WATER SYSTEM · 75 people · 2019 | 2/9 | SYR4 |
| Chromium | 1.355 µg/L 1.4% of the EPA limit 100 µg/L Highest in the city: BIG BEND LANDOWNERS ASSOCIATION · 419 people · 2018 | 2/9 | SYR4 |
| Lead | 0.0054 mg/L 36% of the EPA limit 0.0150 mg/L Highest in the city: BIG BEND LANDOWNERS ASSOCIATION · 419 people · 2024 | 6/9 | 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.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Monroe
| Supplier | Population served |
|---|---|
| MONROE WATER SYSTEM | 23,467 |
| HIGHLAND WATER DISTRICT | 3,121 |
| BIG BEND LANDOWNERS ASSOCIATION | 419 |
| FRIAR CREEK WATER SYSTEM | 135 |
| Peoples Creek Water System | 76 |
| THUNDERBIRD TERRACE WATER SYSTEM | 75 |
| SEVENTH HEAVEN COUNTRY CLUB | 48 |
| FERN BLUFF ESTATES | 30 |
| WOODS CREEK WATER DISTRICT | 25 |
Frequently asked questions about Monroe tap water
Is Monroe tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Monroe. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Monroe?
9 public water suppliers report drinking-water monitoring for Monroe, Washington to the EPA. Each is listed above with its population served.
What contaminants are in Monroe's water?
The contaminants EPA monitoring detected in Monroe include Nitrate, Nitrate-Nitrite, Fluoride, Nitrite, Total Haloacetic Acids (HAA5). The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.