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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 25, 2024 and September 25, 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 16–30 of 346 samples in this date range, newest first.

Routine (15).

Coliform and microbial sample results for City of Madison, 16 to 30 of 346 samples shown, newest first. A result is a presence-or-absence verdict and carries no measured amount.
Result Organism
Collected
Jul 6, 2026 14:10
Sampling point
TC0003 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35922
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 6, 2026 14:10, sampling point TC0003 Coliform (TCR)
Absence , sample collected Jul 6, 2026 14:10, sampling point TC0003 E. Coli
Collected
Jul 6, 2026 13:55
Sampling point
TC0008 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35923
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 6, 2026 13:55, sampling point TC0008 Coliform (TCR)
Absence , sample collected Jul 6, 2026 13:55, sampling point TC0008 E. Coli
Collected
Jul 6, 2026 14:30
Sampling point
TC0011 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35921
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 6, 2026 14:30, sampling point TC0011 Coliform (TCR)
Absence , sample collected Jul 6, 2026 14:30, sampling point TC0011 E. Coli
Collected
Jul 6, 2026 14:55
Sampling point
TC0020 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35919
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 6, 2026 14:55, sampling point TC0020 Coliform (TCR)
Absence , sample collected Jul 6, 2026 14:55, sampling point TC0020 E. Coli
Collected
Jul 6, 2026 14:40
Sampling point
TC0023 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35920
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 6, 2026 14:40, sampling point TC0023 Coliform (TCR)
Absence , sample collected Jul 6, 2026 14:40, sampling point TC0023 E. Coli
Collected
Jul 6, 2026 15:15
Sampling point
TC0029 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35918
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 6, 2026 15:15, sampling point TC0029 Coliform (TCR)
Absence , sample collected Jul 6, 2026 15:15, sampling point TC0029 E. Coli
Collected
Jul 1, 2026 09:21
Sampling point
TC0001 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35967
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 1, 2026 09:21, sampling point TC0001 Coliform (TCR)
Absence , sample collected Jul 1, 2026 09:21, sampling point TC0001 E. Coli
Collected
Jul 1, 2026 11:40
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35963
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 1, 2026 11:40, sampling point TC0005 Coliform (TCR)
Absence , sample collected Jul 1, 2026 11:40, sampling point TC0005 E. Coli
Collected
Jul 1, 2026 10:52
Sampling point
TC0010 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35965
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 1, 2026 10:52, sampling point TC0010 Coliform (TCR)
Absence , sample collected Jul 1, 2026 10:52, sampling point TC0010 E. Coli
Collected
Jul 1, 2026 09:51
Sampling point
TC0012 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35966
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 1, 2026 09:51, sampling point TC0012 Coliform (TCR)
Absence , sample collected Jul 1, 2026 09:51, sampling point TC0012 E. Coli
Collected
Jul 1, 2026 08:13
Sampling point
TC0015 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35949
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 1, 2026 08:13, sampling point TC0015 Coliform (TCR)
Absence , sample collected Jul 1, 2026 08:13, sampling point TC0015 E. Coli
Collected
Jul 1, 2026 08:51
Sampling point
TC0016 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35948
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 1, 2026 08:51, sampling point TC0016 Coliform (TCR)
Absence , sample collected Jul 1, 2026 08:51, sampling point TC0016 E. Coli
Collected
Jul 1, 2026 11:13
Sampling point
TC0019 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35962
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 1, 2026 11:13, sampling point TC0019 Coliform (TCR)
Absence , sample collected Jul 1, 2026 11:13, sampling point TC0019 E. Coli
Collected
Jul 1, 2026 11:25
Sampling point
TC0028 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35964
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 1, 2026 11:25, sampling point TC0028 Coliform (TCR)
Absence , sample collected Jul 1, 2026 11:25, sampling point TC0028 E. Coli
Collected
Jul 1, 2026 12:22
Sampling point
TC0034 Outside Faucet
Sample type
Routine
Lab sample
BACT-250708-35950
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 1, 2026 12:22, sampling point TC0034 Coliform (TCR)
Absence , sample collected Jul 1, 2026 12:22, sampling point TC0034 E. Coli