Water Quality Report · Updated May 12, 2026
SKAGIT COUNTY PUD 1 JUDY RES
SKAGIT COUNTY PUD 1 JUDY RES delivers tap water graded C (68/100) by TapWaterSafety.org. The utility serves approximately 111,415 residents in Mount Vernon, Washington using surface water. 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.
Is Mount Vernon tap water safe to drink?
SKAGIT COUNTY PUD 1 JUDY RES delivers tap water that earns a grade of C (68/100) from TapWaterSafety.org — an average rating, with several contaminants above health guidelines but generally compliant with US legal limits.
The utility serves 111,415 residents in Mount Vernon, drawing from surface water.
Public testing data identifies 9 contaminants in this water above EWG's health-based guidelines, including: Haloacetic acids (HAA9), Haloacetic acids (HAA5), Total trihalomethanes (TTHMs), Dichloroacetic acid, Trichloroacetic acid, Chloroform, Bromodichloromethane, Chlorite, Chromium (hexavalent). For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for Mount Vernon residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for SKAGIT COUNTY PUD 1 JUDY RES.
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.
Contact SKAGIT COUNTY PUD 1 JUDY RES
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for Mount Vernon
Filters matched to the specific contaminants in this water supply.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 68/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
SKAGIT COUNTY PUD 1 JUDY RES service area
This water system serves 1 community in Skagit County, Washington. Click any city for its dedicated tap water quality page.
Find the right filter for Mount Vernon water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.