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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

MS0250024 , St Thomas Water Association

40 of the 74 analytes this system has been tested for have been detected at least once, across 307 samples on record.

The other 34 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 307 samples on record, detections range from August 9, 1993 to June 17, 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 St Thomas Water Association, 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
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 64 of 68 results Sep 13, 2004 Jun 17, 2026
TTHM 2950 Organic Chemical 64 of 67 results Sep 29, 2004 Jun 17, 2026
Copper, Free 1022 Inorganic Chemical 64 of 71 results Aug 9, 1993 Jun 30, 2023
Lead 1030 Inorganic Chemical 47 of 71 results Aug 9, 1993 Jun 29, 2023
Chloroform 2941 Organic Chemical 25 of 28 results May 15, 2006 Jun 17, 2026
Bromodichloromethane 2943 Organic Chemical 22 of 28 results May 15, 2006 Jun 17, 2026
Trichloroacetic Acid 2452 Organic Chemical 20 of 23 results Jan 28, 2008 Jun 17, 2026
Dichloroacetic Acid 2451 Organic Chemical 19 of 23 results Jan 28, 2008 Jun 17, 2026
Fluoride 1025 Inorganic Chemical 17 of 17 results Sep 17, 2003 Feb 18, 2025
Dibromochloromethane 2944 Organic Chemical 15 of 28 results May 15, 2006 Jun 17, 2026
Barium 1010 Inorganic Chemical 15 of 15 results Sep 17, 2003 Feb 18, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 10 of 10 results Dec 12, 2011 Jul 10, 2012
Chromium 1020 Inorganic Chemical 9 of 15 results Sep 17, 2003 May 17, 2022
Monochloroacetic Acid 2450 Organic Chemical 7 of 23 results Jan 28, 2008 Jan 4, 2010
Sulfate 1055 Inorganic Chemical 6 of 6 results Sep 17, 2003 Dec 16, 2008
Sodium 1052 Inorganic Chemical 5 of 5 results Dec 16, 2008 Feb 7, 2024
Nickel 1036 Inorganic Chemical 4 of 15 results Mar 14, 2005 Apr 16, 2008
Nitrate 1040 Inorganic Chemical 3 of 33 results May 10, 2004 Feb 19, 2014
Dibromoacetic Acid 2454 Organic Chemical 3 of 23 results Jan 28, 2008 Jan 4, 2010
Selenium 1045 Inorganic Chemical 3 of 15 results Mar 13, 2005 Apr 16, 2008
Nitrite 1041 Inorganic Chemical 2 of 33 results Apr 23, 2007 Feb 1, 2023
Nitrate-Nitrite 1038 Inorganic Chemical 2 of 33 results Feb 19, 2014 Feb 19, 2014
Calcium 1016 Inorganic Chemical 2 of 2 results Dec 16, 2008 Dec 16, 2008
Chloride 1017 Inorganic Chemical 2 of 2 results Dec 16, 2008 Dec 16, 2008
Magnesium 1031 Inorganic Chemical 2 of 2 results Dec 16, 2008 Dec 16, 2008
Manganese 1032 Inorganic Chemical 2 of 2 results Dec 16, 2008 Dec 16, 2008
Potassium 1042 Inorganic Chemical 2 of 2 results Dec 16, 2008 Dec 16, 2008
Residue, Total, Filterable 1057 Water Quality 2 of 2 results Dec 16, 2008 Dec 16, 2008
Alkalinity, Caco3 Stability 1067 Water Quality 2 of 2 results Dec 16, 2008 Dec 16, 2008
Carbon Dioxide 1901 Water Quality 2 of 2 results Dec 16, 2008 Dec 16, 2008
Color 1905 Water Quality 2 of 2 results Dec 16, 2008 Dec 16, 2008
Hardness, Total (As Caco3) 1915 Water Quality 2 of 2 results Dec 16, 2008 Dec 16, 2008
PH 1925 Water Quality 2 of 2 results Dec 16, 2008 Dec 16, 2008
Alkalinity, Total 1927 Water Quality 2 of 2 results Dec 16, 2008 Dec 16, 2008
Iron, Field Result FEFD Inorganic Chemical 2 of 2 results Dec 16, 2008 Dec 16, 2008
Calculated Sodium NACA Water Quality 2 of 2 results Dec 16, 2008 Dec 16, 2008
PH, Field Result PHFD Water Quality 2 of 2 results Dec 16, 2008 Dec 16, 2008
Temperature, Field Result TEMP Water Quality 2 of 2 results Dec 16, 2008 Dec 16, 2008
Monobromoacetic Acid 2453 Organic Chemical 1 of 23 results Jan 4, 2010 Jan 4, 2010
Thallium, Total 1085 Inorganic Chemical 1 of 15 results Mar 13, 2005 Mar 13, 2005

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 61–70 of 307 samples, newest first — collected January 13, 2022 to July 21, 2022. The summary above covers all 307.

42 results from the 10 samples listed here: 10 detected, 32 not detected. Across the whole record it is 460 of 1,194. 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 St Thomas Water Association, every result from 61 to 70 of 307 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
Jul 21, 2022 08:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-220721-022
Laboratory
MSDH Lab
7.84 ug/l , sample collected Jul 21, 2022 08:00, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jul 1, 2022 – Sep 30, 2022
Collected
Jul 21, 2022 08:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
TH-220721-022
Laboratory
MSDH Lab
171 ug/l , sample collected Jul 21, 2022 08:00, sampling point SM1 TTHM 2950 EPA method 524.2 Jul 1, 2022 – Sep 30, 2022
Collected
May 17, 2022 09:35
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
IN-220517-094
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 17, 2022 09:35, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0034 mg/l , sample collected May 17, 2022 09:35, sampling point TF102 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 17, 2022 09:35, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0008 mg/l , sample collected May 17, 2022 09:35, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.398 mg/l , sample collected May 17, 2022 09:35, sampling point TF102 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 17, 2022 09:35, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 17, 2022 09:35, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected May 17, 2022 09:35, sampling point TF102 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 17, 2022 09:35, sampling point TF102 Antimony, Total 1074 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 17, 2022 09:35, sampling point TF102 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected May 17, 2022 09:35, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
May 5, 2022 10:20
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
VO-220506-003
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Dichloromethane 2964 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Benzene 2990 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Toluene 2991 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 5, 2022 10:20, sampling point TF102 Styrene 2996 EPA method 524.2 Jan 1, 2017 – Dec 31, 2022
Collected
Apr 14, 2022 08:40
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
HA-220415-012
Laboratory
MSDH Lab
50 ug/l , sample collected Apr 14, 2022 08:40, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2022 – Jun 30, 2022
Collected
Apr 14, 2022 08:12
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-220415-011
Laboratory
MSDH Lab
57.4 ug/l , sample collected Apr 14, 2022 08:12, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2022 – Jun 30, 2022
Collected
Apr 14, 2022 08:40
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
TH-220415-012
Laboratory
MSDH Lab
87.4 ug/l , sample collected Apr 14, 2022 08:40, sampling point SM2 TTHM 2950 EPA method 524.2 Apr 1, 2022 – Jun 30, 2022
Collected
Apr 14, 2022 08:15
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
TH-220415-011
Laboratory
MSDH Lab
86.5 ug/l , sample collected Apr 14, 2022 08:15, sampling point SM1 TTHM 2950 EPA method 524.2 Apr 1, 2022 – Jun 30, 2022
Collected
Feb 2, 2022 15:10
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-220203-025
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 2, 2022 15:10, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2022 – Dec 31, 2022
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 2, 2022 15:10, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2022 – Dec 31, 2022
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 2, 2022 15:10, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2022 – Dec 31, 2022
Collected
Jan 13, 2022 10:00
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
HA-220114-007
Laboratory
MSDH Lab
33.2 ug/l , sample collected Jan 13, 2022 10:00, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2022 – Mar 31, 2022

Routine (10).