Is Nashua, IA Tap Water Safe to Drink?
Graded A-, with 3 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
89.5/100
waterverge.com Nashua, IA — Water Quality Report
Nashua's drinking water received a grade of A- (89.5 out of 100), indicating good water quality. The city's 1 water system serves approximately 1,551 residents using groundwater.
Lead levels were measured at 4.3 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 21 violations on record, including 0 health-based violations. 3 remain unresolved.
What to know about Nashua's water
Nashua ranks #230 out of 436 cities in Iowa for water quality, placing it below average in the state.
Nashua 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, Nashua may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Nashua, IA water safe to drink?
Nashua's drinking water has significant quality concerns based on EPA testing data. With a grade of A- (89.5/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,551 residents using groundwater (wells).
Recent water quality updates for Nashua
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Nashua's water quality assessment. Grade: A- (89.5/100).
Contaminants: Public Notice.
Contaminants: Revised Total Coliform Rule, Nitrate.
Federal disaster declaration (FEMA DR-4289). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4281). Flood event — may have impacted local water infrastructure.
Contaminants: Fluoride, Mercury, Thallium, Total.
Key contaminant findings
Based on the most recent EPA sampling data for Nashua's water supply.
Well within EPA limits.
Violation history
Nashua's water system has 21 total violations on record, including 0 health-based violations. 3 remain unresolved. 4 violations were issued in the last 5 years.
Flood & environmental risk
Chickasaw County has experienced 9 federally declared disasters since 1969. 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 Cedar River At Charles City, Little Cedar River Near Ionia.
Where does Nashua's water come from?
Nashua's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,551 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Cedar River At Charles City (river), Little Cedar River Near Ionia (river).
What Nashua residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Nashua'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.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Nashua'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
Superfund sites within 10 miles of Nashua
Superfund sites nearby
Federally tracked hazardous-waste sites on the EPA National Priorities List. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
- SHAW AVENUE DUMP9.5 mi
Source: EPA Superfund National Priorities List
Flood & disaster history
Chickasaw County has experienced 9 federally declared disasters since 1969. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
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. | 4.3 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Nashua compares by contaminant
Explore where Nashua ranks among all Iowa cities for specific contaminants.
Water source & infrastructure
Where Nashua's water comes from
Nashua'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 1,551 people through 1 water system.
Water bodies near Nashua
Nashua is located near 2 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Nashua
| System Name | PWSID | Population | Source |
|---|---|---|---|
| NASHUA WATER SUPPLY | IA1967041 | 1,551 | GW |
How Nashua compares
Full Iowa rankings →Nashua's score of 89.5/100 is above the average of 72/100 among major Iowa cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Iowa rankings →About Nashua, IA
Wikipedia →Nashua is a city in Chickasaw County and Floyd County, Iowa, United States. As of the 2020 census, the city's population was 1,551, a 6.7% decrease from 2010. The famed Little Brown Church featured in the song "The Church in the Wildwood" is located in Nashua.
Learn more about your water
Guides and resources related to Nashua's water quality findings.
Explore water quality across Chickasaw
Frequently asked questions
Is Nashua, IA tap water safe to drink?
Nashua's water quality earned a grade of A- (89.5/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #230 out of 436 cities tested in Iowa.
What contaminants are in Nashua's water?
Lead was measured at 4.3 ppb (90th percentile). 21 violations are on record.
How is Nashua'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 Nashua?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Nashua's water come from?
Nashua's water is sourced from Groundwater. The city has 1 water system serving approximately 1,551 residents.
Is Nashua's groundwater at risk of contamination?
Nashua 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 21 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 Nashua's water compare to other cities?
Nashua ranks #230 out of 436 cities in Iowa (better than 47% of state cities) and #2797 out of 15744 cities nationally (82th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Nashua's small water system affect quality?
Nashua's system serves approximately 1,551 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 21 violations on record.