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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.

Arsenic results

MS0230001 , City of Bay St Louis

42 samples have been analysed for Arsenic at City of Bay St Louis.

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 Arsenic result

The table below lists 1–10 of 42 samples, newest first — collected April 27, 2022 to July 8, 2026.

10 Arsenic results from the 10 samples listed here: 5 detected, 5 not detected. Those samples also carried 96 results for other analytes, which are on the full results page.

Units in this table

Arsenic is recorded on this page in ug/l and mg/l. 1 mg/l = 1,000 ug/l.

Arsenic results for City of Bay St Louis, from 1 to 10 of 42 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
Jul 8, 2026
Sampling point
TF105 Treatment Plant T105
Sample type
Routine
Lab sample
35049767004
Laboratory
Pace Analytical Services, LLC
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 8, 2026, sampling point TF105 Arsenic 1005 EPA method 200.8 Jan 1, 2026 – Dec 31, 2031
Collected
Jul 8, 2026
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
35049767003
Laboratory
Pace Analytical Services, LLC
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 8, 2026, sampling point TF104 Arsenic 1005 EPA method 200.8 Jan 1, 2026 – Dec 31, 2031
Collected
Jul 8, 2026
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
35049767002
Laboratory
Pace Analytical Services, LLC
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 8, 2026, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2026 – Dec 31, 2031
Collected
Jul 8, 2026
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
35049767001
Laboratory
Pace Analytical Services, LLC
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 8, 2026, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2026 – Dec 31, 2031
Collected
Feb 5, 2025 11:05
Sampling point
TF105 Treatment Plant T105
Sample type
Routine
Lab sample
IN-250206-051
Laboratory
MSDH Lab
0.0011 mg/l , sample collected Feb 5, 2025 11:05, sampling point TF105 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 5, 2025 10:55
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
IN-250206-050
Laboratory
MSDH Lab
0.0013 mg/l , sample collected Feb 5, 2025 10:55, sampling point TF104 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 5, 2025 10:45
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
IN-250206-049
Laboratory
MSDH Lab
0.0009 mg/l , sample collected Feb 5, 2025 10:45, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jan 11, 2024 12:48
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
IN-240112-001
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 11, 2024 12:48, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Apr 27, 2022 11:41
Sampling point
TF105 Treatment Plant T105
Sample type
Routine
Lab sample
IN-220428-045
Laboratory
MSDH Lab
0.0005 mg/l , sample collected Apr 27, 2022 11:41, sampling point TF105 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Apr 27, 2022 12:14
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
IN-220428-044
Laboratory
MSDH Lab
0.0006 mg/l , sample collected Apr 27, 2022 12:14, sampling point TF104 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022

Routine (10).