Is Nyssa, OR Tap Water Safe to Drink?
Graded B- — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
72.6/100
waterverge.com Nyssa, OR — Water Quality Report
Nyssa's drinking water received a grade of B- (72.6 out of 100), indicating fair water quality. The city's 1 water system serves approximately 3,285 residents using groundwater.
Lead levels were measured at 1.6 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 75 violations on record, including 34 health-based violations. 10 remain unresolved.
What to know about Nyssa's water
Nyssa ranks #75 out of 213 cities in Oregon for water quality, placing it mid-range in the state.
Nyssa relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Nyssa may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 7 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Nyssa, OR water safe to drink?
Nyssa's drinking water has significant quality concerns based on EPA testing data. With a grade of B- (72.6/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 3,285 residents using groundwater (wells).
Recent water quality updates for Nyssa
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Nyssa's water quality assessment. Grade: B- (72.6/100).
Contaminants: Revised Total Coliform Rule.
Contaminants: Consumer Confidence Rule.
Contaminants: Revised Total Coliform Rule.
Federal disaster declaration (FEMA DR-3228). Coastal Storm event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-184). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Nyssa'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
Nyssa's water system has 75 total violations on record, including 34 health-based violations. 10 remain unresolved. 7 violations were issued in the last 5 years.
Flood & environmental risk
Malheur County has experienced 2 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 Dixie Drain Nr Wilder, Boise River Nr Parma, Sand Run Gulch Nr Parma, Snake River.
Where does Nyssa's water come from?
Nyssa's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 3,285 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Dixie Drain Nr Wilder (river), Boise River Nr Parma (river), Sand Run Gulch Nr Parma (river), Snake River (river).
What Nyssa residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Nyssa'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.
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 Nyssa
Industrial polluters nearby
Reported releases to surface water by facilities near Nyssa, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
PERFORMIX NUTRITION SYSTEMS LLC FRUITLAND, ID83619 | — | — | 9.6 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D3 — extreme droughtMalheur County is currently in D3 (extreme drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Malheur County has experienced 2 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 Nyssa'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. | 1.6 | 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. | 2.11 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level (90th percentile)
Latest reading: 2.110 mg/L (1993)
EPA action level: 1.3 mg/L
See how Nyssa compares by contaminant
Explore where Nyssa ranks among all Oregon cities for specific contaminants.
Water source & infrastructure
Where Nyssa's water comes from
Nyssa's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 3,285 people through 1 water system.
Water bodies near Nyssa
Nyssa is located near 4 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Nyssa
| System Name | PWSID | Population | Source |
|---|---|---|---|
| NYSSA, CITY OF | OR4100579 | 3,285 | GW |
How Nyssa compares
Full Oregon rankings →Nyssa's score of 72.6/100 is above the average of 42/100 among major Oregon cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Oregon rankings →About Nyssa, OR
Wikipedia →Nyssa is a city in Malheur County, Oregon, United States. The population was 3,198 at the 2020 census. The city is located along the Snake River on the Idaho border, in the region of far eastern Oregon known as the "Treasure Valley". It is part of the Ontario, OR–ID Micropolitan Statistical Area.
Learn more about your water
Guides and resources related to Nyssa's water quality findings.
Explore water quality across Malheur
Frequently asked questions
Is Nyssa, OR tap water safe to drink?
Nyssa's water quality earned a grade of B- (72.6/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #75 out of 213 cities tested in Oregon.
What contaminants are in Nyssa's water?
Lead was measured at 1.6 ppb (90th percentile). 75 violations are on record.
How is Nyssa'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 Nyssa?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Nyssa's water come from?
Nyssa's water is sourced from Groundwater. The city has 1 water system serving approximately 3,285 residents.
What health violations has Nyssa's water system had?
Nyssa has 34 health-based violations on record. The most recent violation was recorded in June 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 10 violations remain unresolved.
Is Nyssa's groundwater at risk of contamination?
Nyssa uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 75 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Nyssa's water compare to other cities?
Nyssa ranks #75 out of 213 cities in Oregon (better than 65% of state cities) and #10269 out of 15744 cities nationally (35th percentile). The grade of B- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Nyssa's small water system affect quality?
Nyssa's system serves approximately 3,285 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 75 violations on record.