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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

MS0730010 , Lake Arrowhead

1 of 369 results on record was positive for coliform or another organism the agency tests for. The most recent was October 23, 2007.

They fall across 1 of the 282 samples on record.

Every sample on record, October 8, 2003 to July 14, 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 1–15 of 22 samples in this date range, newest first.

Routine (15).

Coliform and microbial sample results for Lake Arrowhead, 1 to 15 of 22 samples shown, newest first. A result is a presence-or-absence verdict and carries no measured amount.
Result Organism
Collected
Jul 14, 2026 11:40
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-250328-17409
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2026 – Jul 31, 2026
Absence , sample collected Jul 14, 2026 11:40, sampling point TC0005 Coliform (TCR)
Absence , sample collected Jul 14, 2026 11:40, sampling point TC0005 E. Coli
Collected
Jun 10, 2026 09:00
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-250328-17408
Laboratory
MSDH Lab
Monitoring period
Jun 1, 2026 – Jun 30, 2026
Absence , sample collected Jun 10, 2026 09:00, sampling point TC0005 Coliform (TCR)
Absence , sample collected Jun 10, 2026 09:00, sampling point TC0005 E. Coli
Collected
May 13, 2026 11:00
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-250328-17407
Laboratory
MSDH Lab
Monitoring period
May 1, 2026 – May 31, 2026
Absence , sample collected May 13, 2026 11:00, sampling point TC0005 Coliform (TCR)
Absence , sample collected May 13, 2026 11:00, sampling point TC0005 E. Coli
Collected
Apr 28, 2026 09:40
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-250328-17406
Laboratory
MSDH Lab
Monitoring period
Apr 1, 2026 – Apr 30, 2026
Absence , sample collected Apr 28, 2026 09:40, sampling point TC0005 Coliform (TCR)
Absence , sample collected Apr 28, 2026 09:40, sampling point TC0005 E. Coli
Collected
Mar 18, 2026 08:30
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-220211-2847
Laboratory
MSDH Lab
Monitoring period
Mar 1, 2026 – Mar 31, 2026
Absence , sample collected Mar 18, 2026 08:30, sampling point TC0005 Coliform (TCR)
Absence , sample collected Mar 18, 2026 08:30, sampling point TC0005 E. Coli
Collected
Feb 24, 2026 09:30
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-250328-17405
Laboratory
MSDH Lab
Monitoring period
Feb 1, 2026 – Feb 28, 2026
Absence , sample collected Feb 24, 2026 09:30, sampling point TC0005 Coliform (TCR)
Absence , sample collected Feb 24, 2026 09:30, sampling point TC0005 E. Coli
Collected
Jan 14, 2026 11:37
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-220211-2844
Laboratory
MSDH Lab
Monitoring period
Jan 1, 2026 – Jan 31, 2026
Absence , sample collected Jan 14, 2026 11:37, sampling point TC0005 Coliform (TCR)
Absence , sample collected Jan 14, 2026 11:37, sampling point TC0005 E. Coli
Collected
Dec 3, 2025 10:45
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-220211-2843
Laboratory
MSDH Lab
Monitoring period
Dec 1, 2025 – Dec 31, 2025
Absence , sample collected Dec 3, 2025 10:45, sampling point TC0005 Coliform (TCR)
Absence , sample collected Dec 3, 2025 10:45, sampling point TC0005 E. Coli
Collected
Nov 12, 2025 11:20
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-220211-2842
Laboratory
MSDH Lab
Monitoring period
Nov 1, 2025 – Nov 30, 2025
Absence , sample collected Nov 12, 2025 11:20, sampling point TC0005 Coliform (TCR)
Absence , sample collected Nov 12, 2025 11:20, sampling point TC0005 E. Coli
Collected
Oct 14, 2025 11:00
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-220211-2841
Laboratory
MSDH Lab
Monitoring period
Oct 1, 2025 – Oct 31, 2025
Absence , sample collected Oct 14, 2025 11:00, sampling point TC0005 Coliform (TCR)
Absence , sample collected Oct 14, 2025 11:00, sampling point TC0005 E. Coli
Collected
Sep 16, 2025 11:10
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-220211-2838
Laboratory
MSDH Lab
Monitoring period
Sep 1, 2025 – Sep 30, 2025
Absence , sample collected Sep 16, 2025 11:10, sampling point TC0005 Coliform (TCR)
Absence , sample collected Sep 16, 2025 11:10, sampling point TC0005 E. Coli
Collected
Aug 6, 2025 11:20
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-220211-2837
Laboratory
MSDH Lab
Monitoring period
Aug 1, 2025 – Aug 31, 2025
Absence , sample collected Aug 6, 2025 11:20, sampling point TC0005 Coliform (TCR)
Absence , sample collected Aug 6, 2025 11:20, sampling point TC0005 E. Coli
Collected
Jul 1, 2025 09:00
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-220211-2836
Laboratory
MSDH Lab
Monitoring period
Jul 1, 2025 – Jul 31, 2025
Absence , sample collected Jul 1, 2025 09:00, sampling point TC0005 Coliform (TCR)
Absence , sample collected Jul 1, 2025 09:00, sampling point TC0005 E. Coli
Collected
Jun 4, 2025 11:15
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-220211-2835
Laboratory
MSDH Lab
Monitoring period
Jun 1, 2025 – Jun 30, 2025
Absence , sample collected Jun 4, 2025 11:15, sampling point TC0005 Coliform (TCR)
Absence , sample collected Jun 4, 2025 11:15, sampling point TC0005 E. Coli
Collected
May 6, 2025 08:30
Sampling point
TC0005 Outside Faucet
Sample type
Routine
Lab sample
BACT-220211-2834
Laboratory
MSDH Lab
Monitoring period
May 1, 2025 – May 31, 2025
Absence , sample collected May 6, 2025 08:30, sampling point TC0005 Coliform (TCR)
Absence , sample collected May 6, 2025 08:30, sampling point TC0005 E. Coli