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This is a rebuild of Drinking Water Watch and not yet the official record. Use the agency’s current Drinking Water Watch for anything you need to rely on.

TTHM results

MS0450010 , City of Madison

24 samples have been analysed for TTHM at City of Madison.

This is one analyte out of the system’s whole record. For what has ever been detected here, and when, see all chemical and radiological results; for everything the system is tested for, see the analyte list.

What counts as a non-detect is defined in the help: Less than Indicator. This system’s violations.

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

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Every TTHM result

The table below lists 1–10 of 24 samples, newest first — collected July 8, 2025 to February 11, 2026.

10 TTHM results from the 10 samples listed here: 10 detected, 0 not detected. Those samples also carried 40 results for other analytes, which are on the full results page.

We withheld the location of 2 sampling points below. The location on record identifies a private home, and we do not publish those. That is our decision, not the agency’s. The sampling point, its type and every result taken there are published unchanged.

TTHM results for City of Madison, from 1 to 10 of 24 samples shown analysed for it, newest first. This view leaves out other analytes on the same samples. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Feb 11, 2026 12:00
Sampling point
SM5 Location withheld
Sample type
Routine
Lab sample
810-180726-4
Laboratory
Eurofins Eaton Analytical South Bend in
34.73 ug/l , sample collected Feb 11, 2026 12:00, sampling point SM5 TTHM 2950 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Collected
Feb 11, 2026 13:25
Sampling point
SM4 TCR Site 6 at Fire Sta #2
Sample type
Routine
Lab sample
810-180726-3
Laboratory
Eurofins Eaton Analytical South Bend in
47 ug/l , sample collected Feb 11, 2026 13:25, sampling point SM4 TTHM 2950 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Collected
Feb 11, 2026 13:00
Sampling point
SM3 TCR Site 18 at McHs
Sample type
Routine
Lab sample
810-180726-2
Laboratory
Eurofins Eaton Analytical South Bend in
43.7 ug/l , sample collected Feb 11, 2026 13:00, sampling point SM3 TTHM 2950 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Collected
Feb 11, 2026 12:45
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
810-180726-1
Laboratory
Eurofins Eaton Analytical South Bend in
32.25 ug/l , sample collected Feb 11, 2026 12:45, sampling point SM2 TTHM 2950 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Collected
Oct 8, 2025 12:55
Sampling point
SM6 TCR Site 22 at Hamil's Restaurant
Sample type
Routine
Lab sample
TH-251009-010
Laboratory
MSDH Lab
78.3 ug/l , sample collected Oct 8, 2025 12:55, sampling point SM6 TTHM 2950 EPA method 524.2 Oct 1, 2025 – Dec 31, 2025
Collected
Oct 8, 2025 13:10
Sampling point
SM5 Location withheld
Sample type
Routine
Lab sample
TH-251009-009
Laboratory
MSDH Lab
69.1 ug/l , sample collected Oct 8, 2025 13:10, sampling point SM5 TTHM 2950 EPA method 524.2 Oct 1, 2025 – Dec 31, 2025
Collected
Oct 8, 2025 13:25
Sampling point
SM4 TCR Site 6 at Fire Sta #2
Sample type
Routine
Lab sample
TH-251009-008
Laboratory
MSDH Lab
72.4 ug/l , sample collected Oct 8, 2025 13:25, sampling point SM4 TTHM 2950 EPA method 524.2 Oct 1, 2025 – Dec 31, 2025
Collected
Oct 8, 2025 12:20
Sampling point
SM3 TCR Site 18 at McHs
Sample type
Routine
Lab sample
TH-251009-007
Laboratory
MSDH Lab
78.8 ug/l , sample collected Oct 8, 2025 12:20, sampling point SM3 TTHM 2950 EPA method 524.2 Oct 1, 2025 – Dec 31, 2025
Collected
Jul 8, 2025 12:00
Sampling point
SM6 TCR Site 22 at Hamil's Restaurant
Sample type
Routine
Lab sample
TH-250709-005
Laboratory
MSDH Lab
25.2 ug/l , sample collected Jul 8, 2025 12:00, sampling point SM6 TTHM 2950 EPA method 524.2 Jul 1, 2025 – Sep 30, 2025
Collected
Jul 8, 2025 12:30
Sampling point
SM5 Location withheld
Sample type
Routine
Lab sample
TH-250709-004
Laboratory
MSDH Lab
40.7 ug/l , sample collected Jul 8, 2025 12:30, sampling point SM5 TTHM 2950 EPA method 524.2 Jul 1, 2025 – Sep 30, 2025

Routine (10).