Is Corydon, IA Tap Water Safe to Drink?
Graded A-, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
87.4/100
waterverge.com Corydon, IA — Water Quality Report
Corydon's drinking water received a grade of A- (87.4 out of 100), indicating good water quality. The city's 1 water system serves approximately 1,610 residents using purchased surface water.
Lead levels were measured at 0.0 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 149 violations on record, including 0 health-based violations. 2 remain unresolved.
What to know about Corydon's water
Corydon ranks #294 out of 436 cities in Iowa 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.
As a small community water system, Corydon may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Corydon, IA water safe to drink?
Corydon's tap water meets most EPA standards but has areas that warrant attention. With a grade of A- (87.4/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 1,610 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Corydon
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Corydon's water quality assessment. Grade: A- (87.4/100).
Contaminants: Revised Total Coliform Rule.
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Federal disaster declaration (FEMA DR-4421). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4119). Flood event — may have impacted local water infrastructure.
Contaminants: trans-1,2-Dichloroethylene, 1,2-Dichloroethane, 1,1,1-Trichloroethane.
Key contaminant findings
Based on the most recent EPA sampling data for Corydon's water supply.
Well within EPA limits.
Violation history
Corydon's water system has 149 total violations on record, including 0 health-based violations. 2 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Wayne County has experienced 6 federally declared disasters since 1973. 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 South Fork Chariton River Near Promise City.
Where does Corydon's water come from?
Corydon's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 1,610 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include South Fork Chariton River Near Promise City (river).
What Corydon 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.
Corydon'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 Corydon
Industrial polluters nearby
Reported releases to surface water by facilities near Corydon, ranked by pounds discharged annually.
Total reported releases to surface water: 422 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
BLENDHOUSE ALLERTON LLC. ALLERTON, IA50008 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 422 | 4.3 mi |
EAST PENN MANUFACTURING CO INC CORYDON, IA50060 | — | — | 1.6 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Wayne County has experienced 6 federally declared disasters since 1973. 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. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Corydon compares by contaminant
Explore where Corydon ranks among all Iowa cities for specific contaminants.
Water source & infrastructure
Where Corydon's water comes from
Corydon'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 local government ownership and serves approximately 1,610 people through 1 water system.
Water bodies near Corydon
Corydon is located near 1 notable water body. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Corydon
| System Name | PWSID | Population | Source |
|---|---|---|---|
| CORYDON WATER SUPPLY | IA9334078 | 1,610 | SWP |
How Corydon compares
Full Iowa rankings →Corydon's score of 87.4/100 is above the average of 72/100 among major Iowa cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Iowa rankings →About Corydon, IA
Learn more about your water
Guides and resources related to Corydon's water quality findings.
Explore water quality across Wayne
Frequently asked questions
Is Corydon, IA tap water safe to drink?
Corydon's water quality earned a grade of A- (87.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #294 out of 436 cities tested in Iowa.
What contaminants are in Corydon's water?
Lead was measured at 0.0 ppb (90th percentile). 149 violations are on record.
How is Corydon'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 Corydon?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Corydon's water come from?
Corydon's water is sourced from Purchased surface water. The city has 1 water system serving approximately 1,610 residents.
How does Corydon's water compare to other cities?
Corydon ranks #294 out of 436 cities in Iowa (better than 33% of state cities) and #4081 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 Corydon's small water system affect quality?
Corydon's system serves approximately 1,610 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 149 violations on record.