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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 166–180 of 346 samples in this date range, newest first.

Routine (15).

Coliform and microbial sample results for City of Madison, 166 to 180 of 346 samples shown, newest first. A result is a presence-or-absence verdict and carries no measured amount.
Result Organism
Collected
Sep 3, 2025 09:20
Sampling point
TC0003 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-36107
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 3, 2025 09:20, sampling point TC0003 Coliform (TCR)
Absence , sample collected Sep 3, 2025 09:20, sampling point TC0003 E. Coli
Collected
Sep 3, 2025 07:50
Sampling point
TC0007 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-36069
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 3, 2025 07:50, sampling point TC0007 Coliform (TCR)
Absence , sample collected Sep 3, 2025 07:50, sampling point TC0007 E. Coli
Collected
Sep 3, 2025 08:05
Sampling point
TC0008 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-36068
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 3, 2025 08:05, sampling point TC0008 Coliform (TCR)
Absence , sample collected Sep 3, 2025 08:05, sampling point TC0008 E. Coli
Collected
Sep 3, 2025 10:05
Sampling point
TC0014 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-36103
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 3, 2025 10:05, sampling point TC0014 Coliform (TCR)
Absence , sample collected Sep 3, 2025 10:05, sampling point TC0014 E. Coli
Collected
Sep 3, 2025 09:50
Sampling point
TC0020 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-36104
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 3, 2025 09:50, sampling point TC0020 Coliform (TCR)
Absence , sample collected Sep 3, 2025 09:50, sampling point TC0020 E. Coli
Collected
Sep 3, 2025 09:30
Sampling point
TC0026 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-36106
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 3, 2025 09:30, sampling point TC0026 Coliform (TCR)
Absence , sample collected Sep 3, 2025 09:30, sampling point TC0026 E. Coli
Collected
Sep 3, 2025 09:35
Sampling point
TC0027 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-36105
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 3, 2025 09:35, sampling point TC0027 Coliform (TCR)
Absence , sample collected Sep 3, 2025 09:35, sampling point TC0027 E. Coli
Collected
Sep 2, 2025 10:41
Sampling point
TC0001 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24294
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 2, 2025 10:41, sampling point TC0001 Coliform (TCR)
Absence , sample collected Sep 2, 2025 10:41, sampling point TC0001 E. Coli
Collected
Sep 2, 2025 09:30
Sampling point
TC0010 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24296
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 2, 2025 09:30, sampling point TC0010 Coliform (TCR)
Absence , sample collected Sep 2, 2025 09:30, sampling point TC0010 E. Coli
Collected
Sep 2, 2025 10:02
Sampling point
TC0011 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24299
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 2, 2025 10:02, sampling point TC0011 Coliform (TCR)
Absence , sample collected Sep 2, 2025 10:02, sampling point TC0011 E. Coli
Collected
Sep 2, 2025 09:45
Sampling point
TC0012 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24300
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 2, 2025 09:45, sampling point TC0012 Coliform (TCR)
Absence , sample collected Sep 2, 2025 09:45, sampling point TC0012 E. Coli
Collected
Sep 2, 2025 11:40
Sampling point
TC0015 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24301
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 2, 2025 11:40, sampling point TC0015 Coliform (TCR)
Absence , sample collected Sep 2, 2025 11:40, sampling point TC0015 E. Coli
Collected
Sep 2, 2025 11:07
Sampling point
TC0016 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24298
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 2, 2025 11:07, sampling point TC0016 Coliform (TCR)
Absence , sample collected Sep 2, 2025 11:07, sampling point TC0016 E. Coli
Collected
Sep 2, 2025 10:13
Sampling point
TC0029 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24295
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 2, 2025 10:13, sampling point TC0029 Coliform (TCR)
Absence , sample collected Sep 2, 2025 10:13, sampling point TC0029 E. Coli
Collected
Sep 2, 2025 10:55
Sampling point
TC0034 Outside Faucet
Sample type
Routine
Lab sample
BACT-240529-24297
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 2, 2025 10:55, sampling point TC0034 Coliform (TCR)
Absence , sample collected Sep 2, 2025 10:55, sampling point TC0034 E. Coli