DES MOINES, IA · Polk County
DES MOINES WATER WORKS Water System
Consumer Confidence Report status
DES MOINES WATER WORKS must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for DES MOINES WATER WORKS.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Iowa’s official records. Always confirm current status with Iowa before making decisions based on this information.
System facts
- System ID (PWSID)
- IA7727031
- System type
- Community Water System
- Population served
- 246,055
- Service connections
- 94,000
- Ownership
- local government
- Water source
- surface water (rivers, lakes, or reservoirs)
DES MOINES WATER WORKS is the largest community water system in Iowa, serving 246,055 people from surface water.
As of August 1, 2026, its federal record holds 14 entries between 1982 and 2014, all of which EPA lists as closed. Nothing has been added since 2014.
Of the 14, 10 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves inorganic chemicals and the Stage 2 Disinfectants and Disinfection Byproducts Rule.
Violation history
Maximum Contaminant Level Violation, Average
Health-basedTTHM
July 1, 2014 – September 30, 2014
ResolvedMaximum Contaminant Level Violation, Average
Health-basedTTHM
April 1, 2014 – June 30, 2014
ResolvedMaximum Contaminant Level Violation, Average
Health-basedTTHM
January 1, 2014 – March 31, 2014
ResolvedMonitoring, Regular
—Nitrate
October 1, 1989 – December 31, 1989
ResolvedMonitoring, Regular
—Nitrate
July 1, 1989 – September 30, 1989
ResolvedMaximum Contaminant Level Violation, Single Sample
Health-basedNitrate
October 1, 1983 – November 30, 1983
ArchivedMonitoring, Regular
—Cadmium
June 25, 1982 – June 24, 1983
ArchivedMonitoring, Regular
—Barium
June 25, 1982 – June 24, 1983
ArchivedMonitoring, Regular
—Arsenic
June 25, 1982 – June 24, 1983
ArchivedMonitoring, Regular
—Selenium
June 25, 1982 – June 24, 1983
ArchivedMonitoring, Regular
—Nitrate
June 25, 1982 – June 24, 1983
ArchivedMonitoring, Regular
—Mercury
June 25, 1982 – June 24, 1983
ArchivedMonitoring, Regular
—Fluoride
June 25, 1982 – June 24, 1983
ArchivedMonitoring, Regular
—Chromium
June 25, 1982 – June 24, 1983
Archived
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| July 1, 2014 – September 30, 2014 | Maximum Contaminant Level Violation, Average | TTHM | Health-based | Resolved |
| April 1, 2014 – June 30, 2014 | Maximum Contaminant Level Violation, Average | TTHM | Health-based | Resolved |
| January 1, 2014 – March 31, 2014 | Maximum Contaminant Level Violation, Average | TTHM | Health-based | Resolved |
| October 1, 1989 – December 31, 1989 | Monitoring, Regular | Nitrate | — | Resolved |
| July 1, 1989 – September 30, 1989 | Monitoring, Regular | Nitrate | — | Resolved |
| October 1, 1983 – November 30, 1983 | Maximum Contaminant Level Violation, Single Sample | Nitrate | Health-based | Archived |
| June 25, 1982 – June 24, 1983 | Monitoring, Regular | Cadmium | — | Archived |
| June 25, 1982 – June 24, 1983 | Monitoring, Regular | Barium | — | Archived |
| June 25, 1982 – June 24, 1983 | Monitoring, Regular | Arsenic | — | Archived |
| June 25, 1982 – June 24, 1983 | Monitoring, Regular | Selenium | — | Archived |
| June 25, 1982 – June 24, 1983 | Monitoring, Regular | Nitrate | — | Archived |
| June 25, 1982 – June 24, 1983 | Monitoring, Regular | Mercury | — | Archived |
| June 25, 1982 – June 24, 1983 | Monitoring, Regular | Fluoride | — | Archived |
| June 25, 1982 – June 24, 1983 | Monitoring, Regular | Chromium | — | Archived |
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
- June 5, 2019State Public Notification received3 linked violations
- December 28, 2018State Formal Notice of Violation issued3 linked violations
- June 13, 2017State Compliance achieved4 linked violations
- May 26, 2017State Public Notification requested2 linked violations
- February 3, 2015State Compliance achieved14 linked violations
- August 4, 2014State Public Notification received5 linked violations
- March 31, 2014State Public Notification received3 linked violations
- March 21, 2014State Formal Notice of Violation issued4 linked violations
- March 21, 2014State Public Notification requested5 linked violations
- November 15, 1987State Intentional no-action1 linked violation
- September 30, 1984Federal issued Formal Notice of Violation5 linked violations
Common questions
Is DES MOINES WATER WORKS required to publish a Consumer Confidence Report?
- Yes. DES MOINES WATER WORKS is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is DES MOINES WATER WORKS’s next Consumer Confidence Report due?
- DES MOINES WATER WORKS’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does DES MOINES WATER WORKS have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for DES MOINES WATER WORKS.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
DES MOINES WATER WORKS
515-283-8751
DES MOINES, IA 50321