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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

MS0090005 , City of Houston

3 of 1,637 results on record were positive for coliform or another organism the agency tests for. The most recent was January 7, 2019.

They fall across 3 of the 1,276 samples on record.

Every sample on record, October 9, 2003 to August 3, 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 26, 2024 and September 26, 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 92 samples in this date range, newest first.

Routine (15).

Coliform and microbial sample results for City of Houston, 16 to 30 of 92 samples shown, newest first. A result is a presence-or-absence verdict and carries no measured amount.
Result Organism
Collected
May 4, 2026 11:28
Sampling point
TC0010 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20384
Laboratory
MSDH Lab
Monitoring period
May 1, 2026 – May 31, 2026
Absence , sample collected May 4, 2026 11:28, sampling point TC0010 Coliform (TCR)
Absence , sample collected May 4, 2026 11:28, sampling point TC0010 E. Coli
Collected
Apr 7, 2026 10:39
Sampling point
TC0002 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20378
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2026 – Apr 30, 2026
Absence , sample collected Apr 7, 2026 10:39, sampling point TC0002 Coliform (TCR)
Absence , sample collected Apr 7, 2026 10:39, sampling point TC0002 E. Coli
Collected
Apr 7, 2026 11:48
Sampling point
TC0003 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20381
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2026 – Apr 30, 2026
Absence , sample collected Apr 7, 2026 11:48, sampling point TC0003 Coliform (TCR)
Absence , sample collected Apr 7, 2026 11:48, sampling point TC0003 E. Coli
Collected
Apr 7, 2026 11:01
Sampling point
TC0009 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20379
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2026 – Apr 30, 2026
Absence , sample collected Apr 7, 2026 11:01, sampling point TC0009 Coliform (TCR)
Absence , sample collected Apr 7, 2026 11:01, sampling point TC0009 E. Coli
Collected
Apr 7, 2026 11:21
Sampling point
TC0010 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20380
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2026 – Apr 30, 2026
Absence , sample collected Apr 7, 2026 11:21, sampling point TC0010 Coliform (TCR)
Absence , sample collected Apr 7, 2026 11:21, sampling point TC0010 E. Coli
Collected
Mar 3, 2026 10:49
Sampling point
TC0002 Outside Faucet
Sample type
Routine
Lab sample
BACT-240206-10191
Laboratory
MSDH Lab
Monitoring period
Mar 1, 2026 – Mar 31, 2026
Absence , sample collected Mar 3, 2026 10:49, sampling point TC0002 Coliform (TCR)
Absence , sample collected Mar 3, 2026 10:49, sampling point TC0002 E. Coli
Collected
Mar 3, 2026 11:46
Sampling point
TC0003 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20377
Laboratory
MSDH Lab
Monitoring period
Mar 1, 2026 – Mar 31, 2026
Absence , sample collected Mar 3, 2026 11:46, sampling point TC0003 Coliform (TCR)
Absence , sample collected Mar 3, 2026 11:46, sampling point TC0003 E. Coli
Collected
Mar 3, 2026 11:01
Sampling point
TC0009 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20345
Laboratory
MSDH Lab
Monitoring period
Mar 1, 2026 – Mar 31, 2026
Absence , sample collected Mar 3, 2026 11:01, sampling point TC0009 Coliform (TCR)
Absence , sample collected Mar 3, 2026 11:01, sampling point TC0009 E. Coli
Collected
Mar 3, 2026 11:21
Sampling point
TC0010 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20346
Laboratory
MSDH Lab
Monitoring period
Mar 1, 2026 – Mar 31, 2026
Absence , sample collected Mar 3, 2026 11:21, sampling point TC0010 Coliform (TCR)
Absence , sample collected Mar 3, 2026 11:21, sampling point TC0010 E. Coli
Collected
Feb 2, 2026 10:50
Sampling point
TC0002 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20341
Laboratory
MSDH Lab
Monitoring period
Feb 1, 2026 – Feb 28, 2026
Absence , sample collected Feb 2, 2026 10:50, sampling point TC0002 Coliform (TCR)
Absence , sample collected Feb 2, 2026 10:50, sampling point TC0002 E. Coli
Collected
Feb 2, 2026 11:47
Sampling point
TC0003 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20344
Laboratory
MSDH Lab
Monitoring period
Feb 1, 2026 – Feb 28, 2026
Absence , sample collected Feb 2, 2026 11:47, sampling point TC0003 Coliform (TCR)
Absence , sample collected Feb 2, 2026 11:47, sampling point TC0003 E. Coli
Collected
Feb 2, 2026 11:00
Sampling point
TC0009 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20342
Laboratory
MSDH Lab
Monitoring period
Feb 1, 2026 – Feb 28, 2026
Absence , sample collected Feb 2, 2026 11:00, sampling point TC0009 Coliform (TCR)
Absence , sample collected Feb 2, 2026 11:00, sampling point TC0009 E. Coli
Collected
Feb 2, 2026 11:22
Sampling point
TC0010 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20343
Laboratory
MSDH Lab
Monitoring period
Feb 1, 2026 – Feb 28, 2026
Absence , sample collected Feb 2, 2026 11:22, sampling point TC0010 Coliform (TCR)
Absence , sample collected Feb 2, 2026 11:22, sampling point TC0010 E. Coli
Collected
Jan 12, 2026 10:51
Sampling point
TC0002 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20337
Laboratory
MSDH Lab
Monitoring period
Jan 1, 2026 – Jan 31, 2026
Absence , sample collected Jan 12, 2026 10:51, sampling point TC0002 Coliform (TCR)
Absence , sample collected Jan 12, 2026 10:51, sampling point TC0002 E. Coli
Collected
Jan 12, 2026 11:45
Sampling point
TC0003 Outside Faucet
Sample type
Routine
Lab sample
BACT-250403-20340
Laboratory
MSDH Lab
Monitoring period
Jan 1, 2026 – Jan 31, 2026
Absence , sample collected Jan 12, 2026 11:45, sampling point TC0003 Coliform (TCR)
Absence , sample collected Jan 12, 2026 11:45, sampling point TC0003 E. Coli