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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

MS0760076 , Black Bayou Water Assn.

55 of the 73 analytes this system has been tested for have been detected at least once, across 1,097 samples on record.

The other 18 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 1,097 samples on record, detections range from January 29, 2002 to July 22, 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 Black Bayou Water Assn., 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
Fluoride 1025 Inorganic Chemical 115 of 115 results Jan 29, 2002 Jun 29, 2026
TTHM 2950 Organic Chemical 112 of 114 results Aug 25, 2004 Feb 25, 2026
Barium 1010 Inorganic Chemical 110 of 112 results Jan 29, 2002 Jun 12, 2026
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 107 of 109 results Aug 25, 2004 Feb 25, 2026
Copper, Free 1022 Inorganic Chemical 107 of 107 results Aug 21, 2007 Aug 10, 2023
Chromium 1020 Inorganic Chemical 92 of 112 results Jan 29, 2002 Oct 7, 2025
Chloroform 2941 Organic Chemical 71 of 73 results Mar 1, 2006 Feb 25, 2026
Selenium 1045 Inorganic Chemical 64 of 112 results Nov 17, 2003 Oct 7, 2025
Bromodichloromethane 2943 Organic Chemical 62 of 73 results Mar 1, 2006 Feb 25, 2026
Dichloroacetic Acid 2451 Organic Chemical 61 of 63 results Feb 25, 2008 Feb 25, 2026
Arsenic 1005 Inorganic Chemical 59 of 112 results Nov 17, 2003 Oct 7, 2025
Lead 1030 Inorganic Chemical 59 of 107 results Aug 21, 2007 Aug 10, 2023
Dibromochloromethane 2944 Organic Chemical 55 of 73 results Mar 1, 2006 Feb 25, 2026
Trichloroacetic Acid 2452 Organic Chemical 53 of 63 results Feb 25, 2008 Feb 25, 2026
Gross Alpha, Incl. Radon & U 4002 Radionuclide 50 of 50 results Dec 5, 2011 Oct 9, 2012
Xylenes, Total 2955 Organic Chemical 42 of 230 results Jun 27, 2002 Aug 3, 2021
Dibromoacetic Acid 2454 Organic Chemical 30 of 63 results Jul 20, 2009 Feb 25, 2026
Nickel 1036 Inorganic Chemical 28 of 110 results Nov 17, 2003 Jul 8, 2025
Bromoform 2942 Organic Chemical 27 of 73 results May 23, 2006 Mar 25, 2020
Sodium 1052 Inorganic Chemical 19 of 19 results Aug 30, 2006 Jul 22, 2026
Monobromoacetic Acid 2453 Organic Chemical 17 of 63 results Jun 11, 2012 Sep 28, 2020
Ethylbenzene 2992 Organic Chemical 17 of 230 results Sep 26, 2002 Aug 7, 2019
Nitrate-Nitrite 1038 Inorganic Chemical 14 of 203 results Nov 29, 2004 Jul 22, 2026
Nitrate 1040 Inorganic Chemical 14 of 203 results Nov 29, 2004 Jul 22, 2026
Nitrite 1041 Inorganic Chemical 14 of 203 results Aug 7, 2006 Apr 24, 2024
Monochloroacetic Acid 2450 Organic Chemical 14 of 63 results Sep 15, 2009 Jun 30, 2020
Dichloromethane 2964 Organic Chemical 8 of 230 results Sep 8, 2004 Mar 9, 2009
P-Dichlorobenzene 2969 Organic Chemical 5 of 230 results Jun 16, 2005 Mar 12, 2009
Cyanide 1024 Inorganic Chemical 4 of 110 results Apr 12, 2004 Jul 20, 2016
Calcium 1016 Inorganic Chemical 3 of 3 results Aug 30, 2006 Apr 1, 2009
Chloride 1017 Inorganic Chemical 3 of 3 results Aug 30, 2006 Apr 1, 2009
Magnesium 1031 Inorganic Chemical 3 of 3 results Aug 30, 2006 Apr 1, 2009
Manganese 1032 Inorganic Chemical 3 of 3 results Aug 30, 2006 Apr 1, 2009
Potassium 1042 Inorganic Chemical 3 of 3 results Aug 30, 2006 Apr 1, 2009
Sulfate 1055 Inorganic Chemical 3 of 25 results Nov 3, 2003 Apr 1, 2009
Residue, Total, Filterable 1057 Water Quality 3 of 3 results Aug 30, 2006 Apr 1, 2009
Alkalinity, Caco3 Stability 1067 Water Quality 3 of 3 results Aug 30, 2006 Apr 1, 2009
Carbon Dioxide 1901 Water Quality 3 of 3 results Aug 30, 2006 Apr 1, 2009
Color 1905 Water Quality 3 of 3 results Aug 30, 2006 Apr 1, 2009
Hardness, Total (As Caco3) 1915 Water Quality 3 of 3 results Aug 30, 2006 Apr 1, 2009
Alkalinity, Total 1927 Water Quality 3 of 3 results Aug 30, 2006 Apr 1, 2009
Calculated Sodium NACA Water Quality 3 of 3 results Aug 30, 2006 Apr 1, 2009
PH, Field Result PHFD Water Quality 3 of 3 results Aug 30, 2006 Apr 1, 2009
PH 1925 Water Quality 2 of 2 results Aug 30, 2006 Apr 1, 2009
Carbon Tetrachloride 2982 Organic Chemical 2 of 230 results Sep 8, 2004 Aug 18, 2008
Cadmium 1015 Inorganic Chemical 2 of 112 results May 2, 2005 May 2, 2005
Toluene 2991 Organic Chemical 2 of 230 results Sep 26, 2002 Nov 6, 2002
Combined Radium (-226 & -228) 4010 Radionuclide 1 of 51 results Jun 24, 2020 Jun 24, 2020
Radium-226 4020 Radionuclide 1 of 51 results Jun 24, 2020 Jun 24, 2020
Radium-228 4030 Radionuclide 1 of 51 results Jun 24, 2020 Jun 24, 2020
Combined Uranium 4006 Radionuclide 1 of 45 results May 22, 2012 May 22, 2012
Temperature, Field Result TEMP Water Quality 1 of 1 result Aug 30, 2006 Aug 30, 2006
Mercury 1035 Inorganic Chemical 1 of 110 results Apr 25, 2006 Apr 25, 2006
Styrene 2996 Organic Chemical 1 of 230 results Feb 23, 2005 Feb 23, 2005
1,2-Dichloroethane 2980 Organic Chemical 1 of 230 results Sep 8, 2004 Sep 8, 2004

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

Choose a date range

The most recent samples, result by result

The table below lists 41–50 of 69 samples, newest first — collected April 9, 2025 to May 13, 2025. The summary above covers all 69.

23 results from the 10 samples listed here: 12 detected, 11 not detected. Across the whole record it is 1,488 of 8,173. 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 Black Bayou Water Assn., every result from 41 to 50 of 69 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
May 13, 2025 15:30
Sampling point
TF080 TF080 Lake Jackson
Sample type
Routine
Lab sample
CN-250514-013
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 13, 2025 15:30, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2025 – Dec 31, 2025
Collected
May 13, 2025 16:30
Sampling point
TF115 Treatment Plant T103
Sample type
Routine
Lab sample
CN-250514-010
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 13, 2025 16:30, sampling point TF115 Cyanide 1024 EPA method QC10204001X Apr 1, 2025 – Jun 30, 2025
Collected
Apr 22, 2025 15:10
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
HA-250423-023
Laboratory
MSDH Lab
15.4 ug/l , sample collected Apr 22, 2025 15:10, sampling point SMT Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2025 – Jun 30, 2025
Collected
Apr 22, 2025 14:30
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
HA-250423-022
Laboratory
MSDH Lab
17.2 ug/l , sample collected Apr 22, 2025 14:30, sampling point SMH Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2025 – Jun 30, 2025
Collected
Apr 22, 2025 15:10
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
TH-250423-023
Laboratory
MSDH Lab
2.62 ug/l , sample collected Apr 22, 2025 15:10, sampling point SMT TTHM 2950 EPA method 524.2 Apr 1, 2025 – Jun 30, 2025
Collected
Apr 22, 2025 14:30
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
TH-250423-022
Laboratory
MSDH Lab
2.67 ug/l , sample collected Apr 22, 2025 14:30, sampling point SMH TTHM 2950 EPA method 524.2 Apr 1, 2025 – Jun 30, 2025
Collected
Apr 15, 2025 15:25
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-250416-085
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 15, 2025 15:25, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 15, 2025 15:25, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 15, 2025 15:25, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Apr 15, 2025 12:25
Sampling point
TF080 TF080 Lake Jackson
Sample type
Routine
Lab sample
NI-250416-083
Laboratory
MSDH Lab
0.218 mg/l , sample collected Apr 15, 2025 12:25, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
0.218 mg/l , sample collected Apr 15, 2025 12:25, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 15, 2025 12:25, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Apr 9, 2025 14:10
Sampling point
TF115 Treatment Plant T103
Sample type
Routine
Lab sample
IN-250410-021
Laboratory
MSDH Lab
0.0048 mg/l , sample collected Apr 9, 2025 14:10, sampling point TF115 Arsenic 1005 EPA method 200.8 Apr 1, 2025 – Jun 30, 2025
0.0165 mg/l , sample collected Apr 9, 2025 14:10, sampling point TF115 Barium 1010 EPA method 200.8 Apr 1, 2025 – Jun 30, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2025 14:10, sampling point TF115 Cadmium 1015 EPA method 200.8 Apr 1, 2025 – Jun 30, 2025
0.002 mg/l , sample collected Apr 9, 2025 14:10, sampling point TF115 Chromium 1020 EPA method 200.8 Apr 1, 2025 – Jun 30, 2025
0.544 mg/l , sample collected Apr 9, 2025 14:10, sampling point TF115 Fluoride 1025 EPA method QC 10-109-12-2-A Apr 1, 2025 – Jun 30, 2025
0.0009 mg/l , sample collected Apr 9, 2025 14:10, sampling point TF115 Nickel 1036 EPA method 200.8 Not recorded
0.0062 mg/l , sample collected Apr 9, 2025 14:10, sampling point TF115 Selenium 1045 EPA method 200.8 Apr 1, 2025 – Jun 30, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2025 14:10, sampling point TF115 Antimony, Total 1074 EPA method 200.8 Apr 1, 2025 – Jun 30, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2025 14:10, sampling point TF115 Beryllium, Total 1075 EPA method 200.8 Apr 1, 2025 – Jun 30, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2025 14:10, sampling point TF115 Thallium, Total 1085 EPA method 200.8 Apr 1, 2025 – Jun 30, 2025
Collected
Apr 9, 2025 14:20
Sampling point
TF115 Treatment Plant T103
Sample type
Routine
Lab sample
RU-250410-003
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2025 14:20, sampling point TF115 Combined Uranium 4006 EPA method 200.8 Apr 1, 2025 – Jun 30, 2025

Routine (10).