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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

MS0230001 , City of Bay St Louis

43 of the 75 analytes this system has been tested for have been detected at least once, across 676 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 676 samples on record, detections range from October 15, 1992 to July 8, 2026. These figures cover the whole record; the list of samples further down is narrowed.

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 City of Bay St Louis, 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
Copper, Free 1022 Inorganic Chemical 251 of 319 results Oct 15, 1992 Sep 26, 2024
Lead 1030 Inorganic Chemical 214 of 319 results Oct 15, 1992 Sep 26, 2024
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 51 of 51 results Mar 17, 2004 Jun 30, 2026
TTHM 2950 Organic Chemical 51 of 51 results Mar 17, 2004 Jun 30, 2026
Fluoride 1025 Inorganic Chemical 46 of 46 results Jul 16, 2002 Jul 8, 2026
Barium 1010 Inorganic Chemical 42 of 42 results Jul 16, 2002 Jul 8, 2026
Chromium 1020 Inorganic Chemical 34 of 42 results Jul 16, 2002 Feb 5, 2025
Dichloroacetic Acid 2451 Organic Chemical 16 of 16 results Sep 17, 2008 Jun 30, 2026
Sodium 1052 Inorganic Chemical 16 of 16 results May 18, 2011 Jan 31, 2024
Chloroform 2941 Organic Chemical 15 of 16 results Sep 17, 2008 Jun 30, 2026
Nickel 1036 Inorganic Chemical 14 of 38 results Jul 16, 2002 Feb 5, 2025
Trichloroacetic Acid 2452 Organic Chemical 12 of 16 results Apr 13, 2009 Jun 30, 2026
Gross Alpha, Incl. Radon & U 4002 Radionuclide 11 of 11 results Mar 7, 2012 Apr 20, 2013
Gross Alpha Particle Activity 4109 Radionuclide 10 of 11 results Sep 17, 2009 Sep 16, 2013
Monochloroacetic Acid 2450 Organic Chemical 8 of 16 results Apr 13, 2009 Jul 25, 2018
Bromodichloromethane 2943 Organic Chemical 7 of 16 results Apr 13, 2009 Jun 30, 2026
Arsenic 1005 Inorganic Chemical 7 of 42 results Mar 9, 2005 Feb 5, 2025
Combined Radium (-226 & -228) 4010 Radionuclide 6 of 22 results Sep 17, 2009 Mar 3, 2010
Radium-226 4020 Radionuclide 6 of 22 results Sep 17, 2009 Mar 3, 2010
Gross Beta Particle Activity 4100 Radionuclide 6 of 6 results Sep 17, 2009 Mar 3, 2010
Selenium 1045 Inorganic Chemical 6 of 42 results Mar 9, 2005 Apr 2, 2008
Gross Alpha, Excl. Radon & U 4000 Radionuclide 5 of 6 results Sep 17, 2009 Mar 3, 2010
Dibromochloromethane 2944 Organic Chemical 4 of 16 results Apr 13, 2009 Jun 30, 2026
Calcium 1016 Inorganic Chemical 4 of 4 results May 18, 2011 Mar 29, 2017
Chloride 1017 Inorganic Chemical 4 of 4 results May 18, 2011 Mar 29, 2017
Magnesium 1031 Inorganic Chemical 4 of 4 results May 18, 2011 Mar 29, 2017
Manganese 1032 Inorganic Chemical 4 of 4 results May 18, 2011 Mar 29, 2017
Potassium 1042 Inorganic Chemical 4 of 4 results May 18, 2011 Mar 29, 2017
Residue, Total, Filterable 1057 Water Quality 4 of 4 results May 18, 2011 Mar 29, 2017
Alkalinity, Caco3 Stability 1067 Water Quality 4 of 4 results May 18, 2011 Mar 29, 2017
Color 1905 Water Quality 4 of 4 results May 18, 2011 Mar 29, 2017
Hardness, Total (As Caco3) 1915 Water Quality 4 of 4 results May 18, 2011 Mar 29, 2017
Alkalinity, Total 1927 Water Quality 4 of 4 results May 18, 2011 Mar 29, 2017
Calculated Sodium NACA Water Quality 4 of 4 results May 18, 2011 Mar 29, 2017
PH, Field Result PHFD Water Quality 4 of 4 results May 18, 2011 Mar 29, 2017
Monobromoacetic Acid 2453 Organic Chemical 4 of 16 results Sep 17, 2008 Jan 5, 2010
Iron 1028 Inorganic Chemical 3 of 4 results Mar 29, 2017 Mar 29, 2017
Sulfate 1055 Inorganic Chemical 3 of 12 results Jul 16, 2002 Mar 29, 2017
Radium-228 4030 Radionuclide 3 of 22 results Sep 17, 2009 Mar 3, 2010
Cyanide 1024 Inorganic Chemical 2 of 38 results Sep 19, 2011 Sep 19, 2011
Cadmium 1015 Inorganic Chemical 2 of 42 results Mar 9, 2005 Mar 9, 2005
Carbon Tetrachloride 2982 Organic Chemical 1 of 31 results May 4, 2022 May 4, 2022
Carbon Dioxide 1901 Water Quality 1 of 1 result May 18, 2011 May 18, 2011

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

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The most recent samples, result by result

The table below lists 11–20 of 34 samples, newest first — collected February 5, 2025 to June 18, 2025. The summary above covers all 34.

42 results from the 10 samples listed here: 19 detected, 23 not detected. Across the whole record it is 905 of 2,496. 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 City of Bay St Louis, every result from 11 to 20 of 34 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
Jun 18, 2025 12:27
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
CN-250619-004
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jun 18, 2025 12:27, sampling point TF104 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Jun 18, 2025 11:59
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
CN-250619-003
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jun 18, 2025 11:59, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Apr 16, 2025 12:43
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
HA-250417-004
Laboratory
MSDH Lab
55.8 ug/l , sample collected Apr 16, 2025 12:43, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2025 – Jun 30, 2025
Collected
Apr 16, 2025 12:15
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-250417-003
Laboratory
MSDH Lab
32 ug/l , sample collected Apr 16, 2025 12:15, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2025 – Jun 30, 2025
Collected
Apr 16, 2025 12:43
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
TH-250417-005
Laboratory
MSDH Lab
77.7 ug/l , sample collected Apr 16, 2025 12:43, sampling point SM2 TTHM 2950 EPA method 524.2 Apr 1, 2025 – Jun 30, 2025
Collected
Apr 16, 2025 12:15
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
TH-250417-004
Laboratory
MSDH Lab
58 ug/l , sample collected Apr 16, 2025 12:15, sampling point SM1 TTHM 2950 EPA method 524.2 Apr 1, 2025 – Jun 30, 2025
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
0.0138 mg/l , sample collected Feb 5, 2025 11:05, sampling point TF105 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:05, sampling point TF105 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0106 mg/l , sample collected Feb 5, 2025 11:05, sampling point TF105 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.482 mg/l , sample collected Feb 5, 2025 11:05, sampling point TF105 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:05, sampling point TF105 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0069 mg/l , sample collected Feb 5, 2025 11:05, sampling point TF105 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:05, sampling point TF105 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:05, sampling point TF105 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:05, sampling point TF105 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:05, sampling point TF105 Thallium, Total 1085 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
0.0145 mg/l , sample collected Feb 5, 2025 10:55, sampling point TF104 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:55, sampling point TF104 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0128 mg/l , sample collected Feb 5, 2025 10:55, sampling point TF104 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.55 mg/l , sample collected Feb 5, 2025 10:55, sampling point TF104 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:55, sampling point TF104 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0085 mg/l , sample collected Feb 5, 2025 10:55, sampling point TF104 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:55, sampling point TF104 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:55, sampling point TF104 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:55, sampling point TF104 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:55, sampling point TF104 Thallium, Total 1085 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
0.0129 mg/l , sample collected Feb 5, 2025 10:45, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:45, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0125 mg/l , sample collected Feb 5, 2025 10:45, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.58 mg/l , sample collected Feb 5, 2025 10:45, sampling point TF101 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:45, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0081 mg/l , sample collected Feb 5, 2025 10:45, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:45, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:45, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:45, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 10:45, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 5, 2025 12:30
Sampling point
TF105 Treatment Plant T105
Sample type
Routine
Lab sample
NI-250206-055
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 12:30, sampling point TF105 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 12:30, sampling point TF105 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 12:30, sampling point TF105 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025

Routine (10).