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Montezuma Muni 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
1,545 people
Connections
800
Water source
Groundwater
Based in
Montezuma, IA
County
Poweshiek
Owner
Local government
The ZIP code it serves

50171

The short answer

2 results are above the health goal. The worst: Lead, above the health goal. No health-based violations on file since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2005 to 2026.

Arsenic, haloacetic acids (HAA5), total trihalomethanes (TTHM), fluoride, nitrate and chromium (total): Iowa’s own results, samples taken from Jan. 7, 2020 to July 7, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal2

Lead

Comes from pipes, often your own

Above the health goal

6.2ppb

90th percentile, 2026

In the latest period, 9 in 10 homes sampled were at or below 6.2 ppb, below EPA’s action level of 15 ppb. The action level drops to 10 ppb on Nov. 1, 2027. EPA’s health goal for lead is zero.

What handles it

Arsenic

Comes from the source

Above the health goal

1.6ppb

Highest yearly average, 2022

Averaged by year, the highest was 1.6 ppb, in 2022: below EPA’s legal limit of 10 ppb, but above its health goal of zero. That is the only year on file.

What handles it

  • NSF/ANSI 58 look for “Arsenic (Pentavalent)<=50 ppb Reduction”
  • NSF/ANSI 53 look for “Arsenic (Pentavalent)<=50 ppb Reduction”

Below EPA’s limits4

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

54.8ppb

Highest yearly average, 2020 to 2026

2026 average: 21 ppb

Averaged by year, the highest was 54.8 ppb, in 2024, below EPA’s legal limit of 60 ppb. Its highest single sample was 82.7 ppb. In 2026, the latest year on file, its three samples averaged 21 ppb. EPA recorded no violation for haloacetic acids (HAA5) at this utility since 2020. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 49.3 ppb, in 2018.

What handles it

No certification claim covers this compound yet.

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

60.6ppb

Highest yearly average, 2020 to 2026

2026 average: 19.2 ppb

Averaged by year, the highest was 60.6 ppb, in 2023, below EPA’s legal limit of 80 ppb. Its highest single sample was 113 ppb. In 2026, the latest year on file, its three samples averaged 19.2 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 58.1 ppb, in 2018.

What handles it

  • NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
  • NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.66ppm

Highest yearly average, 2020 to 2026

2026 average: 0.6 ppm

Averaged by year, the highest was 0.66 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. Its highest single sample was 0.8 ppm. In 2026, the latest year on file, its two samples averaged 0.6 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.64 ppm, in 2017.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

1.3ppm

Highest sample; found in 8 of 8

2026 average: 1.1 ppm

The highest sample, in 2026, was 1.3 ppm, below EPA’s legal limit of 10 ppm. That was also the latest year on file, and its two samples averaged 1.1 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 2.9 ppm, in 2016.

What handles it

  • NSF/ANSI 58 look for “Nitrate/Nitrite Reduction”
  • NSF/ANSI 53 look for “Nitrate/Nitrite (30 ppm challenge)”
One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Chromium (total)

What handles it

A certification covers specific claims, not a whole standard. Look for these claims on the certifier’s listing, not the box. Wording varies a little: NSF writes “Lead Reduction,” WQA just “Lead.”

  • NSF/ANSI 53

    Claims: Lead Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Lead, Arsenic

    Other certifiers’ wording: Arsenic (III) (50 ppb influent level)

  • NSF/ANSI 58

    Claims: Lead Reduction, Arsenic (Pentavalent)<=50 ppb Reduction

    For: Lead, Arsenic

    Other certifiers’ wording: Arsenic (Pentavalent)<=300 ppb Reduction; Arsenic (V) (300 ppb influent level)

At the tap, or for the whole house?

Lead and copper usually come from pipes and fixtures inside or near your home. A whole-house system sits where water enters, so it cannot catch what your own plumbing adds after it. For those, the filter that counts is the one at the tap. How whole-house systems compare.

Filters with those claims on a certifier’s listing

Disclosure: TapBuff earns a commission if you buy through some links on this page. It does not change which standard or filter we name. As an Amazon Associate, TapBuff earns from qualifying purchases. How TapBuff makes money

Compare five-year costs

The best water filters for lead, ranked

The best reverse osmosis systems, ranked

Violations since 2016

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

What this report can’t tell you

  • Everything else. Arsenic, haloacetic acids (HAA5), total trihalomethanes (TTHM), fluoride, nitrate and chromium (total) results here are Iowa’s own from 2020 on, with EPA’s national file for 2012 to 2019. Montezuma Muni 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. 7, 2020 to July 7, 2026.

Testing your own tap

Montezuma Muni 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 Montezuma Muni Water Supply serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Microbac Laboratories - Newton

    Newton, IA · about 28 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts

    (641) 792-8451

  • State Hygienic Laboratory - Coralville

    Coralville, IA · about 49 miles

    Certified for bacteria, nitrate, organic chemicals, disinfection byproducts, PFAS, radioactivity

    (319) 335-4500

  • Linn County Public Health Department

    Cedar Rapids, IA · about 52 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 IA7950097. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Nearby

All Iowa utilities

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