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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.

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

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 31–40 of 676 samples, newest first — collected July 17, 2024 to October 9, 2024. The summary above covers all 676.

18 results from the 10 samples listed here: 17 detected, 1 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 8 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 31 to 40 of 676 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
Oct 9, 2024 12:26
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
HA-241010-022
Laboratory
MSDH Lab
34.3 ug/l , sample collected Oct 9, 2024 12:26, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2024 – Dec 31, 2024
Collected
Oct 9, 2024 12:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-241010-021
Laboratory
MSDH Lab
24.6 ug/l , sample collected Oct 9, 2024 12:00, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2024 – Dec 31, 2024
Collected
Sep 26, 2024 11:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-240927-010
Laboratory
MSDH Lab
0.442 mg/l , sample collected Sep 26, 2024 11:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
1.4 ug/l , sample collected Sep 26, 2024 11:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Sep 26, 2024 11:10
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-240927-009
Laboratory
MSDH Lab
0.154 mg/l , sample collected Sep 26, 2024 11:10, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
0.6 ug/l , sample collected Sep 26, 2024 11:10, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Jul 17, 2024 06:50
Sampling point
LC0001 Location withheld
Sample type
Routine
Lab sample
PB-240718-105
Laboratory
MSDH Lab
0.365 mg/l , sample collected Jul 17, 2024 06:50, sampling point LC0001 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
9 ug/l , sample collected Jul 17, 2024 06:50, sampling point LC0001 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Jul 17, 2024 07:00
Sampling point
LC0003 Location withheld
Sample type
Routine
Lab sample
PB-240718-104
Laboratory
MSDH Lab
0.0819 mg/l , sample collected Jul 17, 2024 07:00, sampling point LC0003 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 17, 2024 07:00, sampling point LC0003 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Jul 17, 2024 05:05
Sampling point
LC0005 Location withheld
Sample type
Routine
Lab sample
PB-240718-103
Laboratory
MSDH Lab
0.0179 mg/l , sample collected Jul 17, 2024 05:05, sampling point LC0005 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
0.8 ug/l , sample collected Jul 17, 2024 05:05, sampling point LC0005 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Jul 17, 2024 07:00
Sampling point
LC0015 Location withheld
Sample type
Routine
Lab sample
PB-240718-102
Laboratory
MSDH Lab
0.188 mg/l , sample collected Jul 17, 2024 07:00, sampling point LC0015 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
5.7 ug/l , sample collected Jul 17, 2024 07:00, sampling point LC0015 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Jul 17, 2024 07:05
Sampling point
LC0030 Location withheld
Sample type
Routine
Lab sample
PB-240718-101
Laboratory
MSDH Lab
0.313 mg/l , sample collected Jul 17, 2024 07:05, sampling point LC0030 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
2.1 ug/l , sample collected Jul 17, 2024 07:05, sampling point LC0030 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Jul 17, 2024 07:10
Sampling point
LC0031 Location withheld
Sample type
Routine
Lab sample
PB-240718-100
Laboratory
MSDH Lab
0.992 mg/l , sample collected Jul 17, 2024 07:10, sampling point LC0031 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
1.6 ug/l , sample collected Jul 17, 2024 07:10, sampling point LC0031 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024

Routine (10).