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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.

Coliform and microbial samples

MS0450010 , City of Madison

10 of 5,233 results on record were positive for coliform or another organism the agency tests for. The most recent was April 5, 2021.

They fall across 10 of the 3,897 samples on record.

Every sample on record, October 13, 2003 to August 4, 2026. These figures cover the whole record; the list of samples further down is narrowed.

This system’s violations

The most recent samples

Showing samples collected between September 27, 2024 and September 27, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

Choose a date range

The list below shows 241–255 of 346 samples in this date range, newest first.

Routine (15).

Coliform and microbial sample results for City of Madison, 241 to 255 of 346 samples shown, newest first. A result is a presence-or-absence verdict and carries no measured amount.
Result Organism
Collected
May 5, 2025 14:10
Sampling point
TC0028 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24207
Laboratory
MSDH Lab
Monitoring period
May 1, 2025 – May 31, 2025
Absence , sample collected May 5, 2025 14:10, sampling point TC0028 Coliform (TCR)
Absence , sample collected May 5, 2025 14:10, sampling point TC0028 E. Coli
Collected
Apr 2, 2025 14:15
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
BACT-240529-24158
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 2, 2025 14:15, sampling point DS000 Coliform (TCR)
Absence , sample collected Apr 2, 2025 14:15, sampling point DS000 E. Coli
Collected
Apr 2, 2025 13:25
Sampling point
TC0013 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24153
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 2, 2025 13:25, sampling point TC0013 Coliform (TCR)
Absence , sample collected Apr 2, 2025 13:25, sampling point TC0013 E. Coli
Collected
Apr 2, 2025 13:50
Sampling point
TC0014 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24156
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 2, 2025 13:50, sampling point TC0014 Coliform (TCR)
Absence , sample collected Apr 2, 2025 13:50, sampling point TC0014 E. Coli
Collected
Apr 2, 2025 13:37
Sampling point
TC0020 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24154
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 2, 2025 13:37, sampling point TC0020 Coliform (TCR)
Absence , sample collected Apr 2, 2025 13:37, sampling point TC0020 E. Coli
Collected
Apr 2, 2025 13:55
Sampling point
TC0023 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24157
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 2, 2025 13:55, sampling point TC0023 Coliform (TCR)
Absence , sample collected Apr 2, 2025 13:55, sampling point TC0023 E. Coli
Collected
Apr 2, 2025 13:45
Sampling point
TC0026 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24155
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 2, 2025 13:45, sampling point TC0026 Coliform (TCR)
Absence , sample collected Apr 2, 2025 13:45, sampling point TC0026 E. Coli
Collected
Apr 2, 2025 13:18
Sampling point
TC0029 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24152
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 2, 2025 13:18, sampling point TC0029 Coliform (TCR)
Absence , sample collected Apr 2, 2025 13:18, sampling point TC0029 E. Coli
Collected
Apr 1, 2025 09:03
Sampling point
TC0001 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24381
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 1, 2025 09:03, sampling point TC0001 Coliform (TCR)
Absence , sample collected Apr 1, 2025 09:03, sampling point TC0001 E. Coli
Collected
Apr 1, 2025 09:35
Sampling point
TC0003 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24383
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 1, 2025 09:35, sampling point TC0003 Coliform (TCR)
Absence , sample collected Apr 1, 2025 09:35, sampling point TC0003 E. Coli
Collected
Apr 1, 2025 08:10
Sampling point
TC0010 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24382
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 1, 2025 08:10, sampling point TC0010 Coliform (TCR)
Absence , sample collected Apr 1, 2025 08:10, sampling point TC0010 E. Coli
Collected
Apr 1, 2025 08:38
Sampling point
TC0011 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24386
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 1, 2025 08:38, sampling point TC0011 Coliform (TCR)
Absence , sample collected Apr 1, 2025 08:38, sampling point TC0011 E. Coli
Collected
Apr 1, 2025 08:27
Sampling point
TC0012 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24384
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 1, 2025 08:27, sampling point TC0012 Coliform (TCR)
Absence , sample collected Apr 1, 2025 08:27, sampling point TC0012 E. Coli
Collected
Apr 1, 2025 09:15
Sampling point
TC0015 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24387
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 1, 2025 09:15, sampling point TC0015 Coliform (TCR)
Absence , sample collected Apr 1, 2025 09:15, sampling point TC0015 E. Coli
Collected
Apr 1, 2025 09:25
Sampling point
TC0016 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24385
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2025 – Apr 30, 2025
Absence , sample collected Apr 1, 2025 09:25, sampling point TC0016 Coliform (TCR)
Absence , sample collected Apr 1, 2025 09:25, sampling point TC0016 E. Coli