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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

MS0090024 , Thorn Water Association

28 of the 57 analytes this system has been tested for have been detected at least once, across 419 samples on record.

The other 29 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 419 samples on record, detections range from November 30, 1993 to June 29, 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 Thorn 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
Copper, Free 1022 Inorganic Chemical 115 of 149 results Nov 30, 1993 Jun 17, 2025
Lead 1030 Inorganic Chemical 99 of 149 results Nov 30, 1993 Jun 17, 2025
Barium 1010 Inorganic Chemical 31 of 31 results Mar 19, 2002 Jun 29, 2026
Fluoride 1025 Inorganic Chemical 31 of 31 results Mar 19, 2002 Jun 29, 2026
Xylenes, Total 2955 Organic Chemical 23 of 76 results Jul 6, 2004 Aug 2, 2010
Chromium 1020 Inorganic Chemical 17 of 31 results Mar 19, 2002 Jan 13, 2025
TTHM 2950 Organic Chemical 16 of 23 results Jul 11, 2007 Apr 20, 2026
Arsenic 1005 Inorganic Chemical 13 of 31 results Feb 14, 2005 Jan 9, 2024
Nickel 1036 Inorganic Chemical 11 of 29 results Feb 14, 2005 Apr 21, 2014
Bromoform 2942 Organic Chemical 10 of 18 results Dec 13, 2023 Apr 20, 2026
Gross Alpha, Incl. Radon & U 4002 Radionuclide 10 of 15 results Mar 5, 2012 Oct 3, 2012
Selenium 1045 Inorganic Chemical 9 of 31 results Jan 12, 2004 Mar 24, 2008
Dibromochloromethane 2944 Organic Chemical 8 of 18 results Dec 13, 2023 Apr 20, 2026
Sodium 1052 Inorganic Chemical 8 of 8 results Sep 23, 2019 Oct 14, 2024
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 7 of 23 results Jul 11, 2007 Feb 21, 2024
Nitrite 1041 Inorganic Chemical 4 of 65 results Jun 5, 2006 Nov 28, 2006
Ethylbenzene 2992 Organic Chemical 4 of 76 results Jul 6, 2004 Jan 26, 2005
Cyanide 1024 Inorganic Chemical 3 of 27 results Dec 4, 2006 May 2, 2018
Nitrate-Nitrite 1038 Inorganic Chemical 3 of 65 results May 3, 2004 Nov 28, 2006
Sulfate 1055 Inorganic Chemical 3 of 4 results Mar 19, 2002 Jan 12, 2004
Dibromoacetic Acid 2454 Organic Chemical 2 of 16 results Dec 13, 2023 Jul 30, 2024
Cadmium 1015 Inorganic Chemical 2 of 31 results Feb 14, 2005 Feb 14, 2005
Toluene 2991 Organic Chemical 2 of 76 results Jan 26, 2005 Jan 26, 2005
Dichloroacetic Acid 2451 Organic Chemical 1 of 16 results Feb 21, 2024 Feb 21, 2024
Trichloroacetic Acid 2452 Organic Chemical 1 of 16 results Feb 21, 2024 Feb 21, 2024
Monochloroacetic Acid 2450 Organic Chemical 1 of 16 results Jul 13, 2020 Jul 13, 2020
Monobromoacetic Acid 2453 Organic Chemical 1 of 16 results Jul 12, 2011 Jul 12, 2011
Nitrate 1040 Inorganic Chemical 1 of 65 results May 3, 2004 May 3, 2004

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 71–80 of 419 samples, newest first — collected January 13, 2020 to February 1, 2021. The summary above covers all 419.

59 results from the 10 samples listed here: 14 detected, 45 not detected. Across the whole record it is 436 of 2,741. 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 Thorn Water Association, every result from 71 to 80 of 419 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
Feb 1, 2021 14:50
Sampling point
TF103
Sample type
Routine
Lab sample
NI-210202-031
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 1, 2021 14:50, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 1, 2021 14:50, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 1, 2021 14:50, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Feb 1, 2021 15:16
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-210202-029
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 1, 2021 15:16, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 1, 2021 15:16, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 1, 2021 15:16, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Feb 1, 2021 15:13
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-210202-030
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 1, 2021 15:13, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 1, 2021 15:13, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 1, 2021 15:13, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2021 – Dec 31, 2021
Collected
Jul 13, 2020 15:15
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
200714-005TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 13, 2020 15:15, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 13, 2020 15:15, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 13, 2020 15:15, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 13, 2020 15:15, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 4 ug/l Minimum Reporting Level , sample collected Jul 13, 2020 15:15, sampling point MRT000 TTHM 2950 Jan 1, 2020 – Dec 31, 2020
Collected
Jul 13, 2020 15:15
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
200714-005HA
Laboratory
MSDH Lab
0.003 mg/l , sample collected Jul 13, 2020 15:15, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 13, 2020 15:15, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 13, 2020 15:15, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 13, 2020 15:15, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 13, 2020 15:15, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.003 mg/l , sample collected Jul 13, 2020 15:15, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2020 – Dec 31, 2020
Collected
Apr 6, 2020 13:00
Sampling point
TF103
Sample type
Routine
Lab sample
200407-013IN
Laboratory
MSDH Lab
0.0019 mg/l , sample collected Apr 6, 2020 13:00, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
0.0567 mg/l , sample collected Apr 6, 2020 13:00, sampling point TF103 Barium 1010 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:00, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
0.0025 mg/l , sample collected Apr 6, 2020 13:00, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
0.206 mg/l , sample collected Apr 6, 2020 13:00, sampling point TF103 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2019 – Dec 31, 2021
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:00, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:00, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:00, sampling point TF103 Selenium 1045 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:00, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:00, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:00, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Apr 6, 2020 13:10
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
200407-012IN
Laboratory
MSDH Lab
0.0019 mg/l , sample collected Apr 6, 2020 13:10, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.056 mg/l , sample collected Apr 6, 2020 13:10, 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 Apr 6, 2020 13:10, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0025 mg/l , sample collected Apr 6, 2020 13:10, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.207 mg/l , sample collected Apr 6, 2020 13:10, 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 Apr 6, 2020 13:10, 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 Apr 6, 2020 13:10, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:10, 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 Apr 6, 2020 13:10, 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 Apr 6, 2020 13:10, 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 Apr 6, 2020 13:10, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Apr 6, 2020 13:05
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
200407-011IN
Laboratory
MSDH Lab
0.0019 mg/l , sample collected Apr 6, 2020 13:05, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0574 mg/l , sample collected Apr 6, 2020 13:05, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:05, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.0023 mg/l , sample collected Apr 6, 2020 13:05, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
0.209 mg/l , sample collected Apr 6, 2020 13:05, sampling point TF101 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 Apr 6, 2020 13:05, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:05, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:05, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 6, 2020 13:05, sampling point TF101 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 Apr 6, 2020 13:05, sampling point TF101 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 Apr 6, 2020 13:05, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2020 – Dec 31, 2022
Collected
Jan 13, 2020 15:00
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
200114-059NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 13, 2020 15:00, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 13, 2020 15:00, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 13, 2020 15:00, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Collected
Jan 13, 2020 15:20
Sampling point
TF103
Sample type
Routine
Lab sample
200114-058NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 13, 2020 15:20, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 13, 2020 15:20, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 13, 2020 15:20, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2020 – Dec 31, 2020

Routine (10).