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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 680 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 680 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 32 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 451–460 of 680 samples, newest first — collected October 21, 2004 to August 15, 2005. The summary above covers all 680.

72 results from the 10 samples listed here: 20 detected, 52 not detected. Across the whole record it is 905 of 2,529. A sample is analysed for many analytes at once, so one sample appears on as many rows as it had results.

Chemical and radiological sample results for City of Bay St Louis, every result from 451 to 460 of 680 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
Aug 15, 2005
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
050816-067NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Aug 15, 2005, sampling point TF104 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2005 – Dec 31, 2005
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Aug 15, 2005, sampling point TF104 Nitrate 1040 EPA method 353.2 Jan 1, 2005 – Dec 31, 2005
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Aug 15, 2005, sampling point TF104 Nitrite 1041 EPA method 353.2 Jan 1, 2005 – Dec 31, 2005
Collected
Mar 9, 2005
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
050310-026CN
Laboratory
MSDH Lab
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2005 – Dec 31, 2007
Collected
Mar 9, 2005
Sampling point
TF105 Treatment Plant T105
Sample type
Routine
Lab sample
050310-025CN
Laboratory
MSDH Lab
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF105 Cyanide 1024 EPA method QC10204001X Jan 1, 2005 – Dec 31, 2007
Collected
Mar 9, 2005
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
050310-006CN
Laboratory
MSDH Lab
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jan 1, 2005 – Dec 31, 2007
Collected
Mar 9, 2005
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
050310-005CN
Laboratory
MSDH Lab
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF104 Cyanide 1024 EPA method QC10204001X Jan 1, 2005 – Dec 31, 2007
Collected
Mar 9, 2005
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
050310-068IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.017943 mg/l , sample collected Mar 9, 2005, sampling point TF103 Barium 1010 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.000119 mg/l , sample collected Mar 9, 2005, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.003222 mg/l , sample collected Mar 9, 2005, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.406414 mg/l , sample collected Mar 9, 2005, sampling point TF103 Fluoride 1025 EPA method 380-75WE Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0002 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
0.001666 mg/l , sample collected Mar 9, 2005, sampling point TF103 Selenium 1045 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Mar 9, 2005
Sampling point
TF105 Treatment Plant T105
Sample type
Routine
Lab sample
050310-065IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF105 Arsenic 1005 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.016698 mg/l , sample collected Mar 9, 2005, sampling point TF105 Barium 1010 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF105 Cadmium 1015 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.005169 mg/l , sample collected Mar 9, 2005, sampling point TF105 Chromium 1020 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.466985 mg/l , sample collected Mar 9, 2005, sampling point TF105 Fluoride 1025 EPA method 380-75WE Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0002 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF105 Mercury 1035 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF105 Nickel 1036 EPA method 200.8 Not recorded
0.001522 mg/l , sample collected Mar 9, 2005, sampling point TF105 Selenium 1045 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF105 Antimony, Total 1074 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF105 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF105 Thallium, Total 1085 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Mar 9, 2005
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
050310-066IN
Laboratory
MSDH Lab
0.000587 mg/l , sample collected Mar 9, 2005, sampling point TF104 Arsenic 1005 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.046412 mg/l , sample collected Mar 9, 2005, sampling point TF104 Barium 1010 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.000226 mg/l , sample collected Mar 9, 2005, sampling point TF104 Cadmium 1015 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.004157 mg/l , sample collected Mar 9, 2005, sampling point TF104 Chromium 1020 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.529695 mg/l , sample collected Mar 9, 2005, sampling point TF104 Fluoride 1025 EPA method 380-75WE Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0002 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF104 Mercury 1035 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.001715 mg/l , sample collected Mar 9, 2005, sampling point TF104 Nickel 1036 EPA method 200.8 Not recorded
0.005618 mg/l , sample collected Mar 9, 2005, sampling point TF104 Selenium 1045 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF104 Antimony, Total 1074 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF104 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF104 Thallium, Total 1085 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Mar 9, 2005
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
050310-067IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.015119 mg/l , sample collected Mar 9, 2005, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.00375 mg/l , sample collected Mar 9, 2005, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.544513 mg/l , sample collected Mar 9, 2005, sampling point TF101 Fluoride 1025 EPA method 380-75WE Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0002 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
0.001733 mg/l , sample collected Mar 9, 2005, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 9, 2005, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Oct 21, 2004
Sampling point
TF104 Treatment Plant T104
Sample type
Routine
Lab sample
041022-041VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Xylenes, Total 2955 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Dichloromethane 2964 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 O-Dichlorobenzene 2968 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 P-Dichlorobenzene 2969 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Vinyl Chloride 2976 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 1,1-Dichloroethylene 2977 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 1,2-Dichloroethane 2980 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 1,1,1-Trichloroethane 2981 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Carbon Tetrachloride 2982 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 1,2-Dichloropropane 2983 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Trichloroethylene 2984 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 1,1,2-Trichloroethane 2985 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Tetrachloroethylene 2987 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Chlorobenzene 2989 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Benzene 2990 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Toluene 2991 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Ethylbenzene 2992 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 21, 2004, sampling point TF104 Styrene 2996 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004

Routine (10).