Disinfection byproducts · 2024

TTHM in Des Moines, IA tap water

Detected — no federal limit

Des Moines, IA's 2024 report shows TTHM detected, but the EPA has not set an enforceable federal limit for it.

The measurement

StatisticValue
Reported level
SE Polk Rural Water**
74
Reported level
Earlham
49
Reported level
New Virginia
59
Reported level
Des Moines*
68–84
Reported level
Johnston
34–76
Reported level
Bondurant
42–61
Reported level
Clive
57–71
Reported level
Waukee
66
Reported level
Warren Water District
62
Reported level
Johnston
55
Reported level
Urbandale
72
Reported level
Clive
64
Reported level
East Dallas Water
34–47
Reported level
Warren Water District
50–74
Reported level
Ankeny
26–73
Reported level
Bondurant
54
Reported level
Norwalk
69
Reported level
East Dallas Water
41
Reported level
Des Moines*
77
Reported level
Urbandale
59–99
Reported level
Norwalk
59–78
Reported level
New Virginia
54–70
Reported level
SE Polk Rural Water**
64–83
Reported level
Ankeny
57
Reported level
Waukee
53–83

Verbatim from Des Moines, IA's 2024 Consumer Confidence Report — source document ↗

About TTHM

Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.

Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.

How Des Moines, IA compares

5 of the 1176 systems measuring TTHM on The Water Map have it at or above the federal limit:

Nearby systems also reporting TTHM:

People also ask

+Is there TTHM in Des Moines, IA tap water?

Yes — Des Moines, IA's 2024 Consumer Confidence Report lists TTHM at 59–99. Des Moines, IA's 2024 report shows TTHM detected, but the EPA has not set an enforceable federal limit for it.

+What's the federal limit for TTHM in drinking water?

The EPA has not set an enforceable federal limit for TTHM. Utilities still report any measured levels in their annual Consumer Confidence Report.

+What is TTHM?

Total trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter. Long-term exposure above the federal limit is linked to liver, kidney, and central-nervous-system effects and increased cancer risk.

+Which other U.S. cities have TTHM over the federal limit?

5 of the 1176 systems on The Water Map measuring TTHM report it at or above the federal limit. Examples include Calexico, City of — Calexico, Ca, CA, White Fence Farms Mwc No.3 — Lancaster, Ca, CA, Greensboro, NC.

+Where does this TTHM measurement come from?

This page reproduces the TTHM entry from the 2024 Consumer Confidence Report published by the Des Moines, IA water utility — the annual drinking-water report every U.S. utility is required by federal law to publish. The original source document is archived at /water/ia/des-moines/2024/source.

Full report
All Des Moines, IA water-quality data →
Every contaminant measured in the 2024 report.
Contaminant pillar
TTHM across the U.S. →
Every public water system measuring TTHM, ranked.