Is Treynor, IA Tap Water Safe to Drink?
Graded A- — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
87.5/100
waterverge.com Treynor, IA — Water Quality Report
Treynor's drinking water received a grade of A- (87.5 out of 100), indicating good water quality. The city's 1 water system serves approximately 1,049 residents using groundwater.
Lead levels were measured at 5.0 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 7 violations on record, including 0 health-based violations. All violations have been resolved.
What to know about Treynor's water
Treynor ranks #289 out of 436 cities in Iowa for water quality, placing it below average in the state.
Treynor 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, Treynor may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Treynor, IA water safe to drink?
Based on EPA testing data, Treynor's tap water is generally safe to drink. The water system earned a grade of A- (87.5/100), meeting federal drinking water standards across key contaminant categories. The city's 1 water system serves approximately 1,049 residents using groundwater (wells).
Recent water quality updates for Treynor
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Treynor's water quality assessment. Grade: A- (87.5/100).
Contaminants: Nitrate, Nitrite.
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Contaminants: Revised Total Coliform Rule.
Federal disaster declaration (FEMA DR-4421). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-1998). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Treynor'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
Treynor's water system has 7 total violations on record, including 0 health-based violations. All violations have been resolved. 5 violations were issued in the last 5 years.
Flood & environmental risk
Pottawattamie County has experienced 8 federally declared disasters since 1965. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Treynor's water come from?
Treynor's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,049 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Treynor residents can do
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.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Treynor'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
Flood & disaster history
Pottawattamie County has experienced 8 federally declared disasters since 1965. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Treynor'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. | 5.0 | 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. | 1.91 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level trend (90th percentile)
See how Treynor compares by contaminant
Explore where Treynor ranks among all Iowa cities for specific contaminants.
Water source & infrastructure
Where Treynor's water comes from
Treynor'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 1,049 people through 1 water system.
Water systems serving Treynor
| System Name | PWSID | Population | Source |
|---|---|---|---|
| TREYNOR WATER DEPARTMENT | IA7866031 | 1,049 | GW |
How Treynor compares
Full Iowa rankings →Treynor's score of 87.5/100 is above the average of 72/100 among major Iowa cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Iowa rankings →About Treynor, IA
Wikipedia →Treynor is a city in Pottawattamie County, Iowa, United States. The population was 1,032 as of the 2020 census.
Learn more about your water
Guides and resources related to Treynor's water quality findings.
Explore water quality across Pottawattamie
Frequently asked questions
Is Treynor, IA tap water safe to drink?
Treynor's water quality earned a grade of A- (87.5/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #289 out of 436 cities tested in Iowa.
What contaminants are in Treynor's water?
Lead was measured at 5.0 ppb (90th percentile). 7 violations are on record.
How is Treynor'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 Treynor?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Treynor's water come from?
Treynor's water is sourced from Groundwater. The city has 1 water system serving approximately 1,049 residents.
Is Treynor's groundwater at risk of contamination?
Treynor 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 7 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 Treynor's water compare to other cities?
Treynor ranks #289 out of 436 cities in Iowa (better than 34% of state cities) and #4035 out of 15744 cities nationally (74th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Treynor's small water system affect quality?
Treynor's system serves approximately 1,049 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 7 violations on record.