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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

MS0700014 , Three Forks Water Association

22 of the 57 analytes this system has been tested for have been detected at least once, across 207 samples on record.

The other 35 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 207 samples on record, detections range from October 29, 2003 to July 20, 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 Three Forks 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 60 of 60 results Aug 16, 2007 Aug 10, 2023
Lead 1030 Inorganic Chemical 41 of 60 results Aug 16, 2007 Aug 10, 2023
Barium 1010 Inorganic Chemical 20 of 20 results Oct 29, 2003 Mar 31, 2025
Fluoride 1025 Inorganic Chemical 20 of 20 results Oct 29, 2003 Mar 31, 2025
Nickel 1036 Inorganic Chemical 15 of 20 results Mar 31, 2004 Mar 31, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 10 of 10 results Dec 21, 2011 Jul 11, 2012
Chromium 1020 Inorganic Chemical 9 of 20 results Mar 31, 2004 Mar 31, 2025
Sodium 1052 Inorganic Chemical 6 of 6 results Oct 7, 2019 Jul 20, 2026
TTHM 2950 Organic Chemical 5 of 17 results Sep 11, 2007 Nov 25, 2024
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 4 of 18 results Jul 15, 2010 Nov 25, 2024
Sulfate 1055 Inorganic Chemical 4 of 4 results Oct 29, 2003 Mar 31, 2004
Dichloroacetic Acid 2451 Organic Chemical 3 of 13 results Oct 29, 2020 Nov 25, 2024
Chloroform 2941 Organic Chemical 3 of 13 results Sep 13, 2016 Nov 25, 2024
Nitrite 1041 Inorganic Chemical 3 of 43 results May 20, 2020 Apr 6, 2022
Nitrate-Nitrite 1038 Inorganic Chemical 3 of 43 results Apr 4, 2011 May 20, 2020
Trichloroacetic Acid 2452 Organic Chemical 2 of 13 results Nov 25, 2024 Nov 25, 2024
Bromodichloromethane 2943 Organic Chemical 2 of 13 results Nov 25, 2024 Nov 25, 2024
Dibromochloromethane 2944 Organic Chemical 2 of 13 results Nov 25, 2024 Nov 25, 2024
Nitrate 1040 Inorganic Chemical 2 of 43 results Apr 4, 2011 Apr 4, 2011
Selenium 1045 Inorganic Chemical 2 of 20 results Mar 1, 2010 Mar 1, 2010
Cadmium 1015 Inorganic Chemical 2 of 20 results Mar 31, 2004 Mar 31, 2004
Monobromoacetic Acid 2453 Organic Chemical 1 of 13 results Oct 29, 2020 Oct 29, 2020

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 17 samples, newest first — collected April 16, 2025 to July 20, 2026. The summary above covers all 17.

90 results from the 10 samples listed here: 2 detected, 88 not detected. Across the whole record it is 219 of 1,035. 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 Three Forks Water Association, every result from 1 to 10 of 17 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 20, 2026
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
35052384002
Laboratory
Pace Analytical Services, LLC
Not detected below 0.05 mg/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Nitrate-Nitrite 1038 Not recorded
Not detected below 0.05 mg/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Nitrate 1040 EPA method 353.2 Not recorded
Not detected below 0.05 mg/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Nitrite 1041 EPA method 353.2 Not recorded
17400 ug/l , sample collected Jul 20, 2026, sampling point TF102 Sodium 1052 EPA method 200.7 Jan 1, 2024 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Dichloromethane 2964 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Benzene 2990 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Toluene 2991 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF102 Styrene 2996 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Collected
Jul 20, 2026
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
35052384001
Laboratory
Pace Analytical Services, LLC
Not detected below 0.05 mg/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Nitrate-Nitrite 1038 Not recorded
Not detected below 0.05 mg/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Nitrate 1040 EPA method 353.2 Not recorded
Not detected below 0.05 mg/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Nitrite 1041 EPA method 353.2 Not recorded
17500 ug/l , sample collected Jul 20, 2026, sampling point TF101 Sodium 1052 EPA method 200.7 Jan 1, 2024 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Benzene 2990 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Toluene 2991 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 20, 2026, sampling point TF101 Styrene 2996 EPA method 524.2 Jan 1, 2023 – Dec 31, 2028
Collected
Dec 8, 2025 14:15
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
CN-251209-021
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Dec 8, 2025 14:15, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Dec 8, 2025 14:00
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
CN-251209-022
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Dec 8, 2025 14:00, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Sep 24, 2025 10:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-165345-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Sep 24, 2025 10:00, sampling point SM1 TTHM 2950 EPA method 524.2 Not recorded
Collected
Sep 23, 2025 15:25
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
IN-250924-018
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 23, 2025 15:25, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Sep 23, 2025 15:45
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
IN-250924-017
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 23, 2025 15:45, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
May 14, 2025 12:45
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
810-148764-2
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2025 – Jun 30, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:45, sampling point SM2 TTHM 2950 EPA method 524.2 Apr 1, 2025 – Jun 30, 2025
Collected
May 14, 2025 12:30
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-148764-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2025 – Jun 30, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 14, 2025 12:30, sampling point SM1 TTHM 2950 EPA method 524.2 Apr 1, 2025 – Jun 30, 2025
Collected
Apr 16, 2025 14:45
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-250417-056
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 16, 2025 14:45, 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 16, 2025 14:45, 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 16, 2025 14:45, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025

Routine (10).