Corydon Water Supply
What EPA’s and Iowa’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.
- Serves
- 1,610 people
- Connections
- 850
- Water source
- Surface water bought from another system
- Based in
- Corydon, IA
- County
- Wayne
- Owner
- Local government
The ZIP code it serves
The short answer
Nothing in EPA’s and Iowa’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. No health-based violations on file since 2016.
What was found
Total trihalomethanes (TTHM) and haloacetic acids (HAA5): Iowa’s own results, samples taken from Jan. 21, 2020 to July 1, 2026, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits2
Total trihalomethanes (TTHM)
Forms or is added in treatment
43.9ppb
Highest yearly average, 2020 to 2026
2026 average: 39.8 ppb
Averaged by year, the highest was 43.9 ppb, in 2020, below EPA’s legal limit of 80 ppb. Its highest single sample was 55.3 ppb. In 2026, the latest year on file, its six samples averaged 39.8 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 58 ppb, in 2015.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Haloacetic acids (HAA5)
Forms or is added in treatment
29.8ppb
Highest yearly average, 2020 to 2026
Averaged by year, the highest was 29.8 ppb, in 2026, below EPA’s legal limit of 60 ppb. Its highest single sample was 54.9 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 23.9 ppb, in 2019.
What handles it
No certification claim covers this compound yet.
One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Lead
Violations since 2016
No health-based violations on file with EPA since 2016. There are 3 monitoring or reporting violations: a sample missed, late or not reported.
What this report can’t tell you
Everything else. Total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Iowa’s own from 2020 on, with EPA’s national file for 2012 to 2019. Corydon Water Supply’s own annual report, which it must send you every year, has the contaminants this page does not show.
Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.
Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; Iowa’s results run from Jan. 21, 2020 to July 1, 2026.
Testing your own tap
The 3 labs Iowa certifies closest to the area Corydon Water Supply serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Microbac Laboratories - Centerville
Centerville, IA · about 22 miles
Certified for bacteria
Microbac Laboratories - Newton
Newton, IA · about 68 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
State Hygienic Laboratory - Ankeny
Ankeny, IA · about 70 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
State Hygienic Laboratory at the University of Iowa: Through the Grants-to-Counties program, private well owners in participating counties can have their water tested for total coliform bacteria and nitrate. Start with the county sanitarian at your county health department. No cost in a participating county. The Grants-to-Counties Program, State Hygienic Lab at the University of Iowa.
All 36 certified labs for IowaSources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- Iowa Department of Natural Resources, Water Supply Programs, results from Jan. 1, 2020 to Oct. 6, 2026, read Oct. 8, 2026
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: Iowa DNR, laboratories certified for drinking water, read Oct. 10, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID IA9334078. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and Iowa’s records for this utility. They don’t cover everything, which is why the next step matters.Every contaminant TapBuff tracks
- Get the utility’s own reportCorydon Water Supply must send you a water quality report every year. It covers contaminants this page does not show.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded