Ciww (Dmww)

What EPA’s and Iowa’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals, plus violations since 2016, with the certification that handles each result.

Serves: 25 people
Connections: 1
Water source: Surface water
Based in: Des Moines, IA
County: Polk
Owner: Local government

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, not everything. No health-based violations on file since 2016.

What was found

Nitrate: Iowa’s own results, samples taken from Jan. 6, 2025 to Sept. 29, 2026.

Below EPA’s limits1

Nitrate

Comes from the source

Below EPA’s limits

9.1ppm

Highest sample; found in 84 of 84

2026 average: 5.9 ppm

The highest sample, in 2026, was 9.1 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its 40 samples averaged 5.9 ppm.

What handles it

NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”

Violations since 2016

No health-based violations on file with EPA since 2016.

What this report can’t tell you

Everything else. Nitrate results here are Iowa’s own from 2025 on, with EPA’s national file for 2012 to 2019. Ciww (Dmww)’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. 6, 2025 to Sept. 29, 2026.

Testing your own tap

Ciww (Dmww)’s results are for the water it sends out. What your own service line, solder and fixtures add shows up only in a test of your tap, by a lab Iowa certifies.

No lab Iowa certifies is within 75 miles of the area Ciww (Dmww) serves on the state’s list. Some take samples by mail; the state’s page lists them all.

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 Iowa