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City of McLouth

What EPA’s and Kansas’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
858 people
Connections
397
Water source
Groundwater
Based in
McLouth, KS
County
Jefferson
Owner
Local government
Hardness
Very hard
The ZIP code it serves

66054

The short answer

1 result is above the health goal. The worst: Arsenic, above the health goal. 1 health-based violation since 2016.

What handles it

What was found

Arsenic, total trihalomethanes (TTHM), haloacetic acids (HAA5), fluoride, nitrate and chromium (total): Kansas’s own results, samples taken from March 3, 2020 to May 5, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the health goal1

Arsenic

Comes from the source

Above the health goal

1.6ppb

Highest yearly average, 2020 to 2026

2026, one sample: 1.6 ppb

Averaged by year, the highest was 1.6 ppb, in 2020: below EPA’s legal limit of 10 ppb, but above its health goal of zero. In 2026, the latest year on file, its one sample was 1.6 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.7 ppb, in 2014.

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 limits5

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

13ppb

Highest yearly average, 2021 to 2025

2025, one sample: 13 ppb

Averaged by year, the highest was 13 ppb, in 2024, below EPA’s legal limit of 80 ppb. In 2025, the latest year on file, its one sample was 13 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 46 ppb, in 2018.

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

7.7ppb

Highest yearly average, 2021 to 2025

Averaged by year, the highest was 7.7 ppb, in 2025, below EPA’s legal limit of 60 ppb. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 7.8 ppb, in 2014.

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, 2020 to 2026

Averaged by year, the highest was 0.5 ppm, in 2026, below EPA’s legal limit of 4.0 ppm. That was also the latest year on file. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 0.43 ppm, in 2014.

What handles it

Nitrate

Comes from the source

Below EPA’s limits

0.93ppm

Highest sample; found in 8 of 10

2026 average: 0.56 ppm

The highest sample, in 2023, was 0.93 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its two samples averaged 0.56 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 1.2 ppm, in 2015.

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

2.1ppb

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 2.1 ppb, in 2023, below EPA’s legal limit of 100 ppb. In 2026, the latest year on file, it wasn’t found in its one sample. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 1.2 ppb, in 2017.

What handles it

One compound tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Lead

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

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

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

  • NSF/ANSI 58

    Claim: Arsenic (Pentavalent)<=50 ppb Reduction

    For: Arsenic

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

At the tap, or for the whole house?

These come with the water itself, so a whole-house system certified for the same claims treats every tap and shower. A filter at the tap treats drinking water for much less. 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

Hardness

Very hard, 310 mg/L (18.1 grains per gallon), at its one sampling point, 2017 to 2026.

Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.

Softeners compared at 18.1 grains per gallon, salt includedSoftener or salt-free conditioner?Kansas water hardness, utility by utility

Violations since 2016

Contaminant or ruleTypePeriodMeasuredStatus
Groundwater RuleRequired treatment for surface water or groundwater was not met.EPA: Treatment Technique (SWTR and GWR)April 1, 2020 to April 30, 2020—Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 7 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 Kansas’s own from 2020 on, with EPA’s national file for 2012 to 2019. City of McLouth’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; Kansas’s results run from March 3, 2020 to May 5, 2026.

Testing your own tap

City of McLouth’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 Kansas certifies.

The 3 labs Kansas certifies closest to the area City of McLouth serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Johnson County Water Quality Laboratory

    Olathe, KS · about 28 miles

    Certified for bacteria, nitrate, lead and copper

    (913) 715-6950

  • Olathe Environmental Laboratory

    Olathe, KS · about 28 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics

    (913) 971-8310

  • Water District No 1 of Johnson County-WaterOne

    Kansas City, KS · about 28 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics

    (913) 895-5800

All 47 certified labs for Kansas

Sources

PWSID KS2008702. Rebuilt from EPA data on Oct. 18, 2026.

Also in Jefferson County

All Kansas utilities

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