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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 471–480 of 680 samples, newest first — collected June 24, 2004 to August 19, 2004. The summary above covers all 680.

39 results from the 10 samples listed here: 17 detected, 22 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 471 to 480 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 19, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
040820-017VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Benzene 2990 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Toluene 2991 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 19, 2004, sampling point TF101 Styrene 2996 EPA method 524.2 Jul 1, 2004 – Sep 30, 2004
Collected
Jun 24, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040625-278PB
Laboratory
MSDH Lab
0.0447 mg/l , sample collected Jun 24, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.0011 mg/l , sample collected Jun 24, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jun 24, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040625-281PB
Laboratory
MSDH Lab
0.0162 mg/l , sample collected Jun 24, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.0028 mg/l , sample collected Jun 24, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jun 24, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040625-361PB
Laboratory
MSDH Lab
0.2149 mg/l , sample collected Jun 24, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.0025 mg/l , sample collected Jun 24, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jun 24, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040625-282PB
Laboratory
MSDH Lab
0.0499 mg/l , sample collected Jun 24, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 24, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jun 24, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040625-356PB
Laboratory
MSDH Lab
0.0417 mg/l , sample collected Jun 24, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.0164 mg/l , sample collected Jun 24, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jun 24, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040625-360PB
Laboratory
MSDH Lab
0.0962 mg/l , sample collected Jun 24, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.0008 mg/l , sample collected Jun 24, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jun 24, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040625-357PB
Laboratory
MSDH Lab
0.0338 mg/l , sample collected Jun 24, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.0013 mg/l , sample collected Jun 24, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jun 24, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040625-248PB
Laboratory
MSDH Lab
0.079 mg/l , sample collected Jun 24, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.0017 mg/l , sample collected Jun 24, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jun 24, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040625-249PB
Laboratory
MSDH Lab
0.0752 mg/l , sample collected Jun 24, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.0022 mg/l , sample collected Jun 24, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004

Routine (10).