Is Gaston, OR Tap Water Safe to Drink?
Graded D — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
45/100
waterverge.com Gaston, OR — Water Quality Report
Gaston's drinking water received a grade of D (45 out of 100), indicating poor water quality. The city's 3 water systems serve approximately 3,325 residents using purchased surface water.
Lead levels were measured at 1.4 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 268 violations on record, including 13 health-based violations. 32 remain unresolved.
What to know about Gaston's water
Gaston ranks #158 out of 213 cities in Oregon for water quality, placing it below average in the state.
The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
The system has seen 44 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Gaston, OR water safe to drink?
Gaston's drinking water has significant quality concerns based on EPA testing data. With a grade of D (45/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 3 water systems serve approximately 3,325 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Gaston
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Gaston's water quality assessment. Grade: D (45/100).
Contaminants: Groundwater Rule.
Contaminants: Groundwater Rule, Revised Total Coliform Rule.
1 health-based. Contaminants: TTHM, Total Haloacetic Acids (HAA5), Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-3228). Coastal Storm event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-1099). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Gaston's water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Gaston's water system has 268 total violations on record, including 13 health-based violations. 32 remain unresolved. 44 violations were issued in the last 5 years.
Flood & environmental risk
Washington County has experienced 5 federally declared disasters since 1964. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Wapato Canal, Wapato Creek, Scoggins, Tualatin River, Scoggins Creek.
Where does Gaston's water come from?
Gaston's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 3 water systems serving approximately 3,325 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Wapato Canal (stream), Wapato Creek (river), Scoggins (river), Tualatin River (river), Scoggins Creek (river).
What Gaston residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Gaston's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Gaston's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Gaston
Industrial polluters nearby
Reported releases to surface water by facilities near Gaston, ranked by pounds discharged annually.
Total reported releases to surface water: 1 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
TTM TECHNOLOGIES N.A. LLC FOREST GROVE, OR97116 | Copper And Copper Compounds | 0 | 6.2 mi |
WESTAK OF OREGON FOREST GROVE, OR97116 | Copper compounds | 0 | 7.0 mi |
STIMSON LUMBER CO. - GASTON GASTON, OR97119 | Lead | 0 | 3.2 mi |
SHELDON MANUFACTURING INC. CORNELIUS, OR97113 | — | — | 7.9 mi |
DMH INC FOREST GROVE, OR97116 | — | — | 7.0 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Washington County has experienced 5 federally declared disasters since 1964. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Gaston's water supply, we recommend the following filter types.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 1.4 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 2.19 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level trend (90th percentile)
See how Gaston compares by contaminant
Explore where Gaston ranks among all Oregon cities for specific contaminants.
Water source & infrastructure
Where Gaston's water comes from
Gaston's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards.
These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge.
The system is operated by private ownership and serves approximately 3,325 people through 3 water systems.
Water bodies near Gaston
Gaston is located near 5 notable water bodies. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Gaston
| System Name | PWSID | Population | Source |
|---|---|---|---|
| LA WATER CO-OP | OR4100313 | 2,500 | SWP |
| GASTON, CITY OF | OR4100312 | 625 | SWP |
| LAURELWOOD WATER USERS | OR4100315 | 200 | GW |
How Gaston compares
Full Oregon rankings →Gaston's score of 45/100 is on par with the average of 42/100 among major Oregon cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Oregon rankings →About Gaston, OR
Learn more about your water
Guides and resources related to Gaston's water quality findings.
Explore water quality across Washington
Frequently asked questions
Is Gaston, OR tap water safe to drink?
Gaston's water quality earned a grade of D (45/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #158 out of 213 cities tested in Oregon.
What contaminants are in Gaston's water?
Lead was measured at 1.4 ppb (90th percentile). 268 violations are on record.
How is Gaston's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Gaston?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Gaston's water come from?
Gaston's water is sourced from Purchased surface water. The city has 3 water systems serving approximately 3,325 residents.
What health violations has Gaston's water system had?
Gaston has 13 health-based violations on record. The most recent violation was recorded in December 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 32 violations remain unresolved.
How does Gaston's water compare to other cities?
Gaston ranks #158 out of 213 cities in Oregon (better than 26% of state cities) and #14258 out of 15744 cities nationally (9th percentile). The grade of D reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.