City of Thayer

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: 433 people
Connections: 231
Water source: Surface water bought from another system
Based in: Thayer, KS
County: Neosho
Owner: Local government

The ZIP code it serves

66776

The short answer

Nothing in EPA’s and Kansas’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. 2 health-based violations since 2016.

What was found

Total trihalomethanes (TTHM) and haloacetic acids (HAA5): Kansas’s own results, samples taken from Jan. 27, 2020 to July 27, 2026, with EPA’s 2012 to 2019 file for earlier years.

Below EPA’s limits2

Total trihalomethanes (TTHM)

Forms or is added in treatment

Below EPA’s limits

75ppb

Highest yearly average, 2020 to 2026

2026, one sample: 45 ppb

Averaged by year, the highest was 75 ppb, in 2025, below EPA’s legal limit of 80 ppb. In 2026, the latest year on file, its one sample was 45 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 95 ppb, in 2014, and EPA recorded a violation in 2017.

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

43ppb

Highest yearly average, 2020 to 2026

2026, one sample: 36 ppb

Averaged by year, the highest was 43 ppb, in 2025, below EPA’s legal limit of 60 ppb. In 2026, the latest year on file, its one sample was 36 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 86 ppb, in 2014.

What handles it

No certification claim covers this compound yet.

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

Lead

Violations since 2016

Contaminant or rule	Type	Period	Measured	Status
TTHM	The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average	July 1, 2017 to Sept. 30, 2017	0.082 MG/L	Resolved
TTHM	The running average was above the legal limit.EPA: Maximum Contaminant Level Violation, Average	April 1, 2017 to June 30, 2017	0.083 MG/L	Resolved
Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 6 monitoring or reporting violations not shown.

What this report can’t tell you

Everything else. Total trihalomethanes (TTHM) and haloacetic acids (HAA5) results here are Kansas’s own from 2020 on, with EPA’s national file for 2012 to 2019. City of Thayer’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 Jan. 27, 2020 to July 27, 2026.

Testing your own tap

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