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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.

Chemical and radiological sample results

MS0300113 , Ocean Beach

25 of the 57 analytes this system has been tested for have been detected at least once, across 363 samples on record.

The other 32 were tested for and never found. An analyte is counted here if any result on record measured it, so this covers the whole history and not the samples listed below.

Across all 363 samples on record, detections range from September 22, 2003 to December 10, 2025. These figures cover the whole record.

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

What has been detected, ever

Every analyte measured above its reporting level at any point in this system’s record, most often detected first. This is not limited to the samples listed below.

Every analyte ever detected for Ocean Beach, with how many results found it and when it was first and last detected. Covers the whole record, not only the samples listed below.
Analyte Kind Detected in First detected Last detected
TTHM 2950 Organic Chemical 61 of 61 results Sep 8, 2004 Dec 10, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 60 of 60 results Sep 8, 2004 Dec 10, 2025
Copper, Free 1022 Inorganic Chemical 59 of 59 results Aug 12, 2008 Jul 12, 2023
Chloroform 2941 Organic Chemical 30 of 30 results Sep 20, 2006 Dec 10, 2025
Bromodichloromethane 2943 Organic Chemical 29 of 30 results Sep 20, 2006 Dec 10, 2025
Barium 1010 Inorganic Chemical 27 of 27 results Sep 22, 2003 Feb 24, 2025
Fluoride 1025 Inorganic Chemical 27 of 27 results Sep 22, 2003 Feb 24, 2025
Dichloroacetic Acid 2451 Organic Chemical 26 of 26 results Oct 11, 2007 Dec 10, 2025
Trichloroacetic Acid 2452 Organic Chemical 24 of 26 results Oct 11, 2007 Dec 10, 2025
Dibromochloromethane 2944 Organic Chemical 24 of 30 results Sep 20, 2006 Dec 10, 2025
Lead 1030 Inorganic Chemical 22 of 59 results Aug 13, 2008 Sep 10, 2020
Chromium 1020 Inorganic Chemical 19 of 27 results Sep 29, 2003 May 18, 2022
Gross Alpha, Incl. Radon & U 4002 Radionuclide 12 of 12 results Dec 7, 2011 Dec 15, 2015
Sulfate 1055 Inorganic Chemical 6 of 6 results Sep 22, 2003 Feb 23, 2004
Monochloroacetic Acid 2450 Organic Chemical 5 of 26 results Jan 31, 2008 Dec 7, 2009
Nickel 1036 Inorganic Chemical 4 of 27 results Jan 12, 2009 May 9, 2017
Sodium 1052 Inorganic Chemical 3 of 3 results Mar 8, 2021 Feb 14, 2024
Selenium 1045 Inorganic Chemical 3 of 27 results Mar 16, 2005 Mar 16, 2005
Nitrate-Nitrite 1038 Inorganic Chemical 2 of 54 results Jun 9, 2008 Feb 14, 2024
Nitrate 1040 Inorganic Chemical 2 of 54 results Jun 9, 2008 Feb 14, 2024
Carbon Tetrachloride 2982 Organic Chemical 2 of 45 results Mar 8, 2017 Mar 8, 2021
Cadmium 1015 Inorganic Chemical 2 of 27 results Mar 16, 2005 Mar 16, 2005
Arsenic 1005 Inorganic Chemical 1 of 27 results Feb 14, 2024 Feb 14, 2024
Combined Radium (-226 & -228) 4010 Radionuclide 1 of 12 results Dec 15, 2015 Dec 15, 2015
Radium-226 4020 Radionuclide 1 of 12 results Dec 15, 2015 Dec 15, 2015

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

The most recent samples, result by result

The table below lists 51–60 of 363 samples, newest first — collected December 13, 2022 to April 19, 2023. The summary above covers all 363.

10 results from the 10 samples listed here: 10 detected, 0 not detected. Across the whole record it is 452 of 1,994. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

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.

Chemical and radiological sample results for Ocean Beach, every result from 51 to 60 of 363 samples shown, newest first. Not detected means the amount was below the level the laboratory can reliably report, which is given beside it.
Result Analyte Monitoring period
Collected
Apr 19, 2023 12:38
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
TH-230420-006
Laboratory
MSDH Lab
8.22 ug/l , sample collected Apr 19, 2023 12:38, sampling point SMT TTHM 2950 EPA method 524.2 Apr 1, 2023 – Jun 30, 2023
Collected
Apr 19, 2023 12:15
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
TH-230420-005
Laboratory
MSDH Lab
8.34 ug/l , sample collected Apr 19, 2023 12:15, sampling point SMH TTHM 2950 EPA method 524.2 Apr 1, 2023 – Jun 30, 2023
Collected
Feb 15, 2023 11:30
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
TH-230216-012
Laboratory
MSDH Lab
4.74 ug/l , sample collected Feb 15, 2023 11:30, sampling point SMT TTHM 2950 EPA method 524.2 Jan 1, 2023 – Mar 31, 2023
Collected
Feb 15, 2023 11:00
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
TH-230216-011
Laboratory
MSDH Lab
4.76 ug/l , sample collected Feb 15, 2023 11:00, sampling point SMH TTHM 2950 EPA method 524.2 Jan 1, 2023 – Mar 31, 2023
Collected
Feb 15, 2023 11:30
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
HA-230216-012
Laboratory
MSDH Lab
6.88 ug/l , sample collected Feb 15, 2023 11:30, sampling point SMT Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2023 – Mar 31, 2023
Collected
Feb 15, 2023 11:00
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
HA-230216-011
Laboratory
MSDH Lab
7.71 ug/l , sample collected Feb 15, 2023 11:00, sampling point SMH Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2023 – Mar 31, 2023
Collected
Dec 13, 2022 12:00
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
HA-221214-026
Laboratory
MSDH Lab
6.25 ug/l , sample collected Dec 13, 2022 12:00, sampling point SMT Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2022 – Dec 31, 2022
Collected
Dec 13, 2022 12:30
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
HA-221214-025
Laboratory
MSDH Lab
4.9 ug/l , sample collected Dec 13, 2022 12:30, sampling point SMH Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2022 – Dec 31, 2022
Collected
Dec 13, 2022 12:00
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
TH-221214-026
Laboratory
MSDH Lab
6.46 ug/l , sample collected Dec 13, 2022 12:00, sampling point SMT TTHM 2950 EPA method 524.2 Oct 1, 2022 – Dec 31, 2022
Collected
Dec 13, 2022 12:30
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
TH-221214-025
Laboratory
MSDH Lab
6.36 ug/l , sample collected Dec 13, 2022 12:30, sampling point SMH TTHM 2950 EPA method 524.2 Oct 1, 2022 – Dec 31, 2022

Routine (10).