What was found in Mount Vernon'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 | 250 µg/L 2.5% of the EPA limit 10000 µg/L Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019
Highest in the city: 2870 µg/L — SKAGIT CO PUD - POTLATCH BEACH · 75 people · 2013 | 7/8 | SYR4 |
| Fluoride | 167.5 µg/L 4.2% of the EPA limit 4000 µg/L Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019
Highest in the city: 820 µg/L — ANACORTES CITY OF · 25,109 people · 2019 | 3/8 | SYR4 |
| Nitrate-Nitrite | 580 µg/L 5.8% of the EPA limit 10000 µg/L Highest in the city: SKAGIT VIEW VILLAGE WATER SYSTEM · 232 people · 2016 | 3/8 | SYR4 |
| TTHM | 52.93 µg/L 66% of the EPA limit 80 µg/L Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019 | 7/8 | SYR4 |
| Chloroform | 50.66 µg/L No EPA limit set Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019 | 6/8 | SYR4 |
| Total Haloacetic Acids (HAA5) | 48 µg/L 80% of the EPA limit 60 µg/L Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019 | 6/8 | SYR4 |
| Barium | 41.9 µg/L 2.1% of the EPA limit 2000 µg/L Highest in the city: SKAGIT CO PUD ROCKPORT · 175 people · 2019 | 6/8 | SYR4 |
| Dichloroacetic Acid | 31.5 µg/L No EPA limit set Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019 | 5/8 | SYR4 |
| Trichloroacetic Acid | 17.8 µg/L No EPA limit set Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019 | 5/8 | SYR4 |
| Copper | 16 µg/L 1.2% of the EPA limit 1300 µg/L Highest in the city: SKAGIT CO PUD ROCKPORT · 175 people · 2019 | 4/8 | SYR4 |
| Bromoform | 6.225 µg/L No EPA limit set Highest in the city: SKAGIT CO PUD - POTLATCH BEACH · 75 people · 2017 | 1/8 | SYR4 |
| Arsenic | 6 µg/L 60% of the EPA limit 10 µg/L Highest in the city: SKAGIT CO PUD - ALGER · 446 people · 2017 | 3/8 | SYR4 |
| Monochloroacetic Acid | 4.41 µg/L No EPA limit set Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019 | 1/8 | SYR4 |
| Bromodichloromethane | 2.3 µg/L No EPA limit set Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019
Highest in the city: 4.27 µg/L — SKAGIT CO PUD - ALGER · 446 people · 2019 | 6/8 | SYR4 |
| Monobromoacetic Acid | 2.565 µg/L No EPA limit set Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019 | 1/8 | SYR4 |
| Dibromoacetic Acid | 1.2 µg/L No EPA limit set Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2019
Highest in the city: 1.965 µg/L — SKAGIT CO PUD - POTLATCH BEACH · 75 people · 2017 | 2/8 | SYR4 |
| Dibromochloromethane | 1.585 µg/L No EPA limit set Highest in the city: SKAGIT CO PUD - ALGER · 446 people · 2019 | 3/8 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.7200 µg/L 12% of the EPA limit 6 µg/L Highest in the city: ANACORTES CITY OF · 25,109 people · 2019 | 1/8 | SYR4 |
| Thallium, Total | 0.1700 µg/L 8.5% of the EPA limit 2 µg/L Highest in the city: ANACORTES CITY OF · 25,109 people · 2019 | 1/8 | SYR4 |
| Pfba | 0.0211 µg/L No EPA limit set Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2025 | 1/8 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: SKAGIT COUNTY PUD 1 JUDY RES · 111,415 people · 2024
Highest in the city: 0.0091 mg/L — SKAGIT CO PUD - MARBLEMOUNT · 238 people · 2024 | 8/8 | 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 Mount Vernon
| Supplier | Population served |
|---|---|
| SKAGIT COUNTY PUD 1 JUDY RES | 111,415 |
| ANACORTES CITY OF | 25,109 |
| SKAGIT CO PUD - ALGER | 446 |
| SKAGIT CO PUD - CEDARGROVE | 400 |
| SKAGIT CO PUD - MARBLEMOUNT | 238 |
| SKAGIT VIEW VILLAGE WATER SYSTEM | 232 |
| SKAGIT CO PUD ROCKPORT | 175 |
| SKAGIT CO PUD - POTLATCH BEACH | 75 |
Frequently asked questions about Mount Vernon tap water
Is Mount Vernon tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Mount Vernon. 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 Mount Vernon?
8 public water suppliers report drinking-water monitoring for Mount Vernon, Washington to the EPA. Each is listed above with its population served.
What contaminants are in Mount Vernon's water?
The contaminants EPA monitoring detected in Mount Vernon include Nitrate, Fluoride, Nitrate-Nitrite, TTHM, Chloroform. 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.