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Marion Co RWD 1

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
780 people
Connections
364
Water source
Groundwater
Based in
Durham, KS
County
Marion
Owner
Local government
Hardness
Moderately hard
The 3 ZIP codes it serves

67438, 67451, 67483

The short answer

1 result is above EPA’s legal limit. The worst: Copper, above the action level. No health-based violations on file since 2016.

What handles it

What was found

Lead and copper: EPA SDWIS monitoring periods ending 2020.

Nitrate, haloacetic acids (HAA5), total trihalomethanes (TTHM), fluoride, arsenic and chromium (total): Kansas’s own results, samples taken from Feb. 11, 2020 to Aug. 23, 2026, with EPA’s 2012 to 2019 file for earlier years.

Above the legal limit1

Copper

Comes from pipes, often your own

Above the action level

1.6ppm

90th percentile, 2018 to 2020

In the latest period, 9 in 10 homes sampled were at or below 1.6 ppm, above EPA’s action level of 1.3 ppm.

What handles it

Below EPA’s limits4

Nitrate

Comes from the source

Below EPA’s limits

2.1ppm

Highest sample; found in 10 of 10

2026 average: 1.6 ppm

The highest sample, in 2023, was 2.1 ppm, below EPA’s legal limit of 10 ppm. In 2026, the latest year on file, its two samples averaged 1.6 ppm. Earlier, from 2012 to 2019, EPA’s file shows a highest sample of 2.4 ppm, in 2013.

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

Below EPA’s limits

12ppb

Highest yearly average, 2020 to 2026

2026, one sample: 5.2 ppb

Averaged by year, the highest was 12 ppb, in 2025, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its one sample was 5.2 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 8.9 ppb, in 2019.

What handles it

No certification claim covers this compound yet.

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

11ppb

Highest yearly average, 2020 to 2026

2026, one sample: 5.6 ppb

Averaged by year, the highest was 11 ppb, in 2025, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 5.6 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 14 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

0.29ppm

Highest yearly average, 2020 to 2026

2026: not found

Averaged by year, the highest was 0.29 ppm, in 2020, below EPA’s legal limit of 4.0 ppm. 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 0.21 ppm, in 2014.

What handles it

3 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
  • Arsenic
  • Chromium (total)
  • 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.”

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

Hardness

Moderately hard, typically 113 mg/L (6.6 grains per gallon), across 2 sampling points, 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 6.6 grains per gallon, salt includedSoftener or salt-free conditioner?Kansas water hardness, utility by utility

Violations since 2016

No health-based violations on file with EPA since 2016. There are 10 monitoring or reporting violations: a sample missed, late or not reported.

What this report can’t tell you

  • Everything else. Nitrate, haloacetic acids (HAA5), total trihalomethanes (TTHM), fluoride, arsenic and chromium (total) results here are Kansas’s own from 2020 on, with EPA’s national file for 2012 to 2019. Marion Co RWD 1’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 Feb. 11, 2020 to Aug. 23, 2026.

Testing your own tap

Marion Co RWD 1’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 Marion Co RWD 1 serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • Pace Analytical Services, Inc. - Salina

    Salina, KS · about 30 miles

    Certified for bacteria, nitrate

    (913) 599-5665

  • Irwin Army Community Hospital-Water Laboratory-PH-EH

    Fort Riley, KS · about 41 miles

    Certified for bacteria

    (785) 239-7516

  • Meridian Analytical Laboratory - Wichita

    Wichita, KS · about 66 miles

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

    (316) 618-8787

All 47 certified labs for Kansas

Sources

PWSID KS2011510. Rebuilt from EPA data on Oct. 18, 2026.

Towns it serves

Also in Marion County

All Kansas utilities

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