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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; 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 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

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

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The most recent samples, result by result

The table below lists 1–10 of 18 samples, newest first — collected February 18, 2025 to June 17, 2026. The summary above covers all 18.

33 results from the 10 samples listed here: 13 detected, 20 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 1 to 10 of 18 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
Jun 17, 2026 09:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
810-196470-2
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Jun 17, 2026 09:00, sampling point DS000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
5.4 ug/l , sample collected Jun 17, 2026 09:00, sampling point DS000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
5.9 ug/l , sample collected Jun 17, 2026 09:00, sampling point DS000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 17, 2026 09:00, sampling point DS000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 17, 2026 09:00, sampling point DS000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
11.3 ug/l , sample collected Jun 17, 2026 09:00, sampling point DS000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Collected
Jun 17, 2026 09:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
810-196470-1
Laboratory
Eurofins Eaton Analytical South Bend in
18 ug/l , sample collected Jun 17, 2026 09:00, sampling point DS000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 17, 2026 09:00, sampling point DS000 Bromoform 2942 EPA method 524.2 Not recorded
3.2 ug/l , sample collected Jun 17, 2026 09:00, sampling point DS000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
0.51 ug/l , sample collected Jun 17, 2026 09:00, sampling point DS000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
21.71 ug/l , sample collected Jun 17, 2026 09:00, sampling point DS000 TTHM 2950 EPA method 524.2 Not recorded
Collected
Mar 2, 2026 15:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-260303-001
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 2, 2026 15:00, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2026 – Dec 31, 2026
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 2, 2026 15:00, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2026 – Dec 31, 2026
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 2, 2026 15:00, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2026 – Dec 31, 2026
Collected
Jul 20, 2025 14:00
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
TH-250721-006
Laboratory
MSDH Lab
8.6 ug/l , sample collected Jul 20, 2025 14:00, sampling point SM2 TTHM 2950 EPA method 524.2 Jul 1, 2025 – Sep 30, 2025
Collected
Jul 20, 2025 14:15
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
TH-250721-005
Laboratory
MSDH Lab
10 ug/l , sample collected Jul 20, 2025 14:15, sampling point SM1 TTHM 2950 EPA method 524.2 Jul 1, 2025 – Sep 30, 2025
Collected
Jul 20, 2025 14:05
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
HA-250721-006
Laboratory
MSDH Lab
8.92 ug/l , sample collected Jul 20, 2025 14:05, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jul 1, 2025 – Sep 30, 2025
Collected
Jul 20, 2025 14:20
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-250721-005
Laboratory
MSDH Lab
9.5 ug/l , sample collected Jul 20, 2025 14:20, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jul 1, 2025 – Sep 30, 2025
Collected
Jun 30, 2025 09:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
CN-250630-008
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Jun 30, 2025 09:00, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Apr 8, 2025 10:14
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-250408-052
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 8, 2025 10:14, 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 8, 2025 10:14, 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 8, 2025 10:14, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Feb 18, 2025 09:20
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
IN-250219-004
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 18, 2025 09:20, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0035 mg/l , sample collected Feb 18, 2025 09:20, sampling point TF102 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 18, 2025 09:20, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 18, 2025 09:20, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.429 mg/l , sample collected Feb 18, 2025 09:20, sampling point TF102 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 18, 2025 09:20, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 18, 2025 09:20, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 18, 2025 09:20, sampling point TF102 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 18, 2025 09:20, sampling point TF102 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 18, 2025 09:20, sampling point TF102 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 18, 2025 09:20, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025

Routine (10).