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Lamoni Municipal Utilities

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
2,029 people
Connections
913
Water source
Surface water
Based in
Lamoni, IA
County
Decatur
Owner
Local government
The ZIP code it serves

50140

The short answer

2 results are above the health goal. The worst: Arsenic, above the health goal. 2 health-based violations since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2008 to 2025.

Arsenic, total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate and chromium (total): Iowa’s own results, samples taken from Jan. 6, 2020 to Aug. 19, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal2

Arsenic

Comes from the source

Above the health goal

0.7ppb

Highest yearly average, 2021 to 2025

Averaged by year, the highest was 0.7 ppb, in 2025: below EPA’s legal limit of 10 ppb, but above its health goal of zero. That was also the latest 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”

Lead

Comes from pipes, often your own

Above the health goal

0.6ppb

90th percentile, 2023 to 2025

In the latest period, 9 in 10 homes sampled were at or below 0.6 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

Below EPA’s limits5

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

68.8ppb

Highest yearly average, 2020 to 2026

2026 average: 36.9 ppb

Averaged by year, the highest was 68.8 ppb, in 2023, below EPA’s legal limit of 80 ppb. Its highest single sample was 131 ppb. In 2026, the latest year on file, its six samples averaged 36.9 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 50.6 ppb, in 2016.

What handles it

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

Haloacetic acids (HAA5)

Forms or is added in treatment

Below EPA’s limits

32ppb

Highest yearly average, 2020 to 2026

2026 average: 28.8 ppb

Averaged by year, the highest was 32 ppb, in 2025, below EPA’s legal limit of 60 ppb. Its highest single sample was 54 ppb. In 2026, the latest year on file, its six samples averaged 28.8 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 29.3 ppb, in 2016.

What handles it

No certification claim covers this compound yet.

Fluoride

Forms or is added in treatment

Below EPA’s limits

0.5ppm

Highest yearly average, 2021 to 2025

2025, one sample: 0.4 ppm

Averaged by year, the highest was 0.5 ppm, in 2021, below EPA’s legal limit of 4.0 ppm. In 2025, the latest year on file, its one sample was 0.4 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.8 ppm, in 2015.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.6ppm

Highest sample; found in 13 of 14

2026 average: 0.2 ppm

The highest sample, in 2023, was 0.6 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its two samples averaged 0.2 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.0 ppm, in 2012.

What handles it

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

Chromium (total)

Comes from the source

Below EPA’s limits

0.8ppb

Highest yearly average, 2021 to 2025

Averaged by year, the highest was 0.8 ppb, in 2025, below EPA’s legal limit of 100 ppb. That was also the latest year on file.

What handles it

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

    For: Arsenic, Lead

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

  • NSF/ANSI 58

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

    For: Arsenic, Lead

    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 reverse osmosis systems, ranked

The best water filters for lead, ranked

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Interim Enhanced Surface Water Treatment RuleOne cloudiness reading was above the maximum allowed.EPA: Single Turbidity Exceed (Enhanced SWTR)June 1, 2026 to June 30, 20262.0 NTUArchived
Surface Water Treatment RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)March 1, 2025 to March 31, 2025—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 11 monitoring or reporting violations not shown.

What this report can’t tell you

  • Everything else. Arsenic, total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate and chromium (total) results here are Iowa’s own from 2020 on, with EPA’s national file for 2012 to 2019. Lamoni Municipal Utilities’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, 2020 to Aug. 19, 2026.

Testing your own tap

Lamoni Municipal Utilities’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 lab Iowa certifies closest to the area Lamoni Municipal Utilities serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Microbac Laboratories - Centerville

    Centerville, IA · about 56 miles

    Certified for bacteria

    (641) 437-7023

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 IA2740050. Rebuilt from EPA data on Oct. 18, 2026.

Also in Decatur County

All Iowa utilities

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