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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.

TTHM results

MS0300113 , Ocean Beach

61 samples have been analysed for TTHM at Ocean Beach.

This is one analyte out of the system’s whole record. For what has ever been detected here, and when, see all chemical and radiological results; for everything the system is tested for, see the analyte list.

What counts as a non-detect is defined in the help: Less than Indicator. This system’s violations.

No date range is applied: this list draws on every sample on record. Show the last two years only.

Every TTHM result

The table below lists 1–10 of 61 samples, newest first — collected October 24, 2023 to December 10, 2025.

10 TTHM results from the 10 samples listed here: 10 detected, 0 not detected. Those samples also carried 10 results for other analytes, which are on the full results page.

We withheld the location of 2 sampling points below. The location on record identifies a private home, and we do not publish those. That is our decision, not the agency’s. The sampling point, its type and every result taken there are published unchanged.

TTHM results for Ocean Beach, from 1 to 10 of 61 samples shown analysed for it, newest first. This view leaves out other analytes on the same samples. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Dec 10, 2025 11:00
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
810-174937-1
Laboratory
Eurofins Eaton Analytical South Bend in
41.2 ug/l , sample collected Dec 10, 2025 11:00, sampling point SMT TTHM 2950 EPA method 524.2 Not recorded
Collected
Oct 9, 2024 09:29
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
TH-241010-020
Laboratory
MSDH Lab
40.6 ug/l , sample collected Oct 9, 2024 09:29, sampling point SMT TTHM 2950 EPA method 524.2 Oct 1, 2024 – Dec 31, 2024
Collected
Oct 9, 2024 09:17
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
TH-241010-019
Laboratory
MSDH Lab
40.3 ug/l , sample collected Oct 9, 2024 09:17, sampling point SMH TTHM 2950 EPA method 524.2 Oct 1, 2024 – Dec 31, 2024
Collected
Jul 16, 2024 09:30
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
TH-240717-016
Laboratory
MSDH Lab
77.2 ug/l , sample collected Jul 16, 2024 09:30, sampling point SMT TTHM 2950 EPA method 524.2 Jul 1, 2024 – Sep 30, 2024
Collected
Jul 16, 2024 09:10
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
TH-240717-015
Laboratory
MSDH Lab
51.6 ug/l , sample collected Jul 16, 2024 09:10, sampling point SMH TTHM 2950 EPA method 524.2 Jul 1, 2024 – Sep 30, 2024
Collected
Apr 15, 2024 12:35
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
TH-240416-012
Laboratory
MSDH Lab
27 ug/l , sample collected Apr 15, 2024 12:35, sampling point SMT TTHM 2950 EPA method 524.2 Apr 1, 2024 – Jun 30, 2024
Collected
Apr 15, 2024 12:15
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
TH-240416-011
Laboratory
MSDH Lab
26.5 ug/l , sample collected Apr 15, 2024 12:15, sampling point SMH TTHM 2950 EPA method 524.2 Apr 1, 2024 – Jun 30, 2024
Collected
Feb 5, 2024 12:39
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
TH-240206-006
Laboratory
MSDH Lab
63.2 ug/l , sample collected Feb 5, 2024 12:39, sampling point SMT TTHM 2950 EPA method 524.2 Jan 1, 2024 – Mar 31, 2024
Collected
Feb 5, 2024 12:24
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
TH-240206-005
Laboratory
MSDH Lab
39.6 ug/l , sample collected Feb 5, 2024 12:24, sampling point SMH TTHM 2950 EPA method 524.2 Jan 1, 2024 – Mar 31, 2024
Collected
Oct 24, 2023 07:50
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
TH-231025-004
Laboratory
MSDH Lab
9.63 ug/l , sample collected Oct 24, 2023 07:50, sampling point SMT TTHM 2950 EPA method 524.2 Oct 1, 2023 – Dec 31, 2023

Routine (10).