Madrid Water Department
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
- 3,090 people
- Connections
- 1,240
- Water source
- Groundwater influenced by surface water
- Based in
- Madrid, IA
- County
- Boone
- 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. 1 health-based violation since 2016.
What was found
Copper: EPA’s file records a utility’s copper only when it exceeds the action level. The last here was 1.9 ppm, for the period ending Dec. 31, 1993. None since is on file, so it is not counted as a current finding.
Total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), fluoride, chromium (total) and arsenic: Iowa’s own results, samples taken from Feb. 11, 2020 to Aug. 19, 2026, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits5
Total trihalomethanes (TTHM)
Forms or is added in treatment
53.8ppb
Highest yearly average, 2020 to 2026
2026 average: 41.5 ppb
Averaged by year, the highest was 53.8 ppb, in 2022, below EPA’s legal limit of 80 ppb. Its highest single sample was 80.4 ppb. In 2026, the latest year on file, its six samples averaged 41.5 ppb. EPA recorded no violation for total trihalomethanes (TTHM) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 52.2 ppb, in 2019.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Nitrate
Comes from the source
5.6ppm
Highest sample; found in 6 of 7
2026, one sample: 5.6 ppm
The highest sample, in 2026, was 5.6 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its one sample was 5.6 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 2.0 ppm, in 2015.
What handles it
- NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
- NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
Haloacetic acids (HAA5)
Forms or is added in treatment
24.2ppb
Highest yearly average, 2020 to 2026
Averaged by year, the highest was 24.2 ppb, in 2026, below EPA’s legal limit of 60 ppb. Its highest single sample was 35.4 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 20.1 ppb, in 2015.
What handles it
No certification claim covers this compound yet.
Fluoride
Forms or is added in treatment
0.6ppm
Highest yearly average, 2021
Averaged by year, the highest was 0.6 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. That is the only year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.7 ppm, in 2012.
What handles it
- NSF/ANSI 58 look for “Fluoride Reduction”
- NSF/ANSI 53 look for “Fluoride”
Chromium (total)
Comes from the source
2.1ppb
Highest yearly average, 2021
Averaged by year, the highest was 2.1 ppb, in 2021, below EPA’s legal limit of 100 ppb. That is the only year on file.
What handles it
- NSF/ANSI 58 look for “Chromium (Hexavalent) Reduction”
- NSF/ANSI 53 look for “Chromium Reduction”
2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Arsenic
- Lead
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Surface Water Treatment Rule | Required treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR) | June 1, 2025 to June 30, 2025 | — | Resolved |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. | ||||
What this report can’t tell you
Everything else. Total trihalomethanes (TTHM), nitrate, haloacetic acids (HAA5), fluoride, chromium (total) and arsenic results here are Iowa’s own from 2020 on, with EPA’s national file for 2012 to 2019. Madrid Water Department’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 Feb. 11, 2020 to Aug. 19, 2026.
Testing your own tap
The 3 labs Iowa certifies closest to the area Madrid Water Department serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
State Hygienic Laboratory - Ankeny
Ankeny, IA · about 14 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics
AgSource
Ellsworth, IA · about 33 miles
Certified for bacteria, nitrate, metals, minerals and other inorganics
Microbac Laboratories - Newton
Newton, IA · about 42 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
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 IA0848015. 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 reportMadrid Water Department 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