Tap Water Quality Report
Tap water quality in Mount Vernon, Washington
Tap water in Mount Vernon, Washington receives a grade of B (80/100) from TapWaterSafety.org. It's served by SKAGIT COUNTY PUD 1 JUDY RES. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in Mount Vernon's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Mount Vernon.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 14.2 ppb, 236x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 11.1 ppb, 111x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 8.81 ppb, 59x above the EWG health guideline of 0.15 ppb.
EPA compliance record
Official U.S. EPA records for SKAGIT COUNTY PUD 1 JUDY RES (system ID WA5379500) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Surface Water Treatment Rule | Missed testing or reporting | 01/01/2026 | Resolved |
| Consumer Confidence Rule | Other (e.g. public notice) | 07/01/2024 | Resolved |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for Mount Vernon
Filters matched to the specific contaminants in Mount Vernon's water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in Mount Vernon's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
14.2 ppb | 0.06 | — | — | — | — | — | 236× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
11.1 ppb | 0.1 | 60.0 | 60 | — | — | — | 111× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
8.81 ppb | 0.15 | 80.0 | 100 | — | — | — | 59× over |
| Dichloroacetic acid Disinfection byproduct |
7.93 ppb | 0.2 | — | — | — | — | — | 40× over |
| Trichloroacetic acid Disinfection byproduct |
2.45 ppb | 0.1 | — | — | — | — | — | 25× over |
| Chloroform Disinfection byproduct |
7.96 ppb | 0.4 | — | — | — | — | — | 20× over |
| Bromodichloromethane Disinfection byproduct |
0.85 ppb | 0.06 | — | — | — | — | — | 14× over |
| Chlorite Disinfection byproduct |
500.4 ppb | 50.0 | 1000.0 | — | — | — | — | 10× over |
| Chromium (hexavalent) Heavy metal |
0.118 ppb | 0.02 | — | — | — | — | — | 5.9× over |
| Chlorate Disinfection byproduct |
134.9 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Dibromoacetic acid Disinfection byproduct |
0.0125 ppb | 0.03 | — | — | — | — | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.572 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
6.4 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Manganese Heavy metal |
0.687 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.1 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0332 ppb | 1500.0 | — | — | — | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from SKAGIT COUNTY PUD 1 JUDY RES.