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Cascade Municipal 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
2,386 people
Connections
1,055
Water source
Groundwater
Based in
Cascade, IA
County
Dubuque
Owner
Local government
The ZIP code it serves

52033

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

Fluoride, arsenic, chromium (total), haloacetic acids (HAA5), nitrate and total trihalomethanes (TTHM): Iowa’s own results, samples taken from July 20, 2020 to Aug. 24, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits1

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.69ppm

Highest yearly average, 2022 to 2023

2023, one sample: 0.68 ppm

Averaged by year, the highest was 0.69 ppm, in 2022, below EPA’s legal limit of 4.0 ppm. In 2023, the latest year on file, its one sample was 0.68 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.72 ppm, in 2013.

What handles it

6 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • Haloacetic acids (HAA5)
  • Lead
  • Nitrate
  • Total trihalomethanes (TTHM)

Violations since 2016

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

What this report can’t tell you

  • Everything else. Fluoride, arsenic, chromium (total), haloacetic acids (HAA5), nitrate and total trihalomethanes (TTHM) results here are Iowa’s own from 2020 on, with EPA’s national file for 2012 to 2019. Cascade Municipal 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 July 20, 2020 to Aug. 24, 2026.

Testing your own tap

Cascade Municipal Water Supply’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.

The 3 labs Iowa certifies closest to the area Cascade Municipal Water Supply serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • ChemRight Laboratories

    Maquoketa, IA · about 20 miles

    Certified for bacteria, nitrate, minerals and other inorganics

    (563) 652-4226

  • Dubuque County Health Department

    Dubuque, IA · about 21 miles

    Certified for bacteria

    (563) 557-7396

  • Linn County Public Health Department

    Cedar Rapids, IA · about 40 miles

    Certified for bacteria, nitrate

    (319) 892-6000

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

Sources

PWSID IA3118080. Rebuilt from EPA data on Oct. 18, 2026.

Also in Dubuque County

All Iowa utilities

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