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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

MS0250001 , Town of Bolton

20 of the 55 analytes this system has been tested for have been detected at least once, across 359 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 359 samples on record, detections range from April 27, 1994 to June 25, 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 Town of Bolton, 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 160 of 180 results Apr 27, 1994 Jun 30, 2023
Lead 1030 Inorganic Chemical 127 of 180 results Apr 27, 1994 Jun 30, 2023
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 23 of 24 results Aug 1, 2007 Jun 25, 2026
TTHM 2950 Organic Chemical 23 of 23 results Aug 1, 2007 Jun 25, 2026
Chloroform 2941 Organic Chemical 19 of 19 results Aug 1, 2007 Jun 25, 2026
Dichloroacetic Acid 2451 Organic Chemical 18 of 19 results Sep 22, 2008 Jun 25, 2026
Trichloroacetic Acid 2452 Organic Chemical 18 of 19 results Jul 19, 2012 Jun 25, 2026
Bromodichloromethane 2943 Organic Chemical 17 of 19 results Aug 1, 2007 Jun 25, 2026
Barium 1010 Inorganic Chemical 15 of 15 results Nov 15, 2004 Mar 6, 2024
Fluoride 1025 Inorganic Chemical 15 of 15 results Nov 15, 2004 Mar 6, 2024
Dibromochloromethane 2944 Organic Chemical 9 of 19 results Aug 1, 2007 May 5, 2025
Chromium 1020 Inorganic Chemical 7 of 15 results Mar 15, 2005 Apr 23, 2020
Selenium 1045 Inorganic Chemical 7 of 15 results Nov 15, 2004 May 10, 2017
Sodium 1052 Inorganic Chemical 6 of 6 results Sep 25, 2019 Feb 7, 2024
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 5 results Dec 21, 2011 Jul 13, 2012
Nickel 1036 Inorganic Chemical 4 of 15 results Mar 15, 2005 Dec 1, 2014
Dibromoacetic Acid 2454 Organic Chemical 3 of 19 results Aug 2, 2018 Aug 26, 2020
Monochloroacetic Acid 2450 Organic Chemical 2 of 19 results Jul 25, 2019 Aug 26, 2020
Nitrate-Nitrite 1038 Inorganic Chemical 2 of 41 results Feb 19, 2014 Feb 19, 2014
Nitrate 1040 Inorganic Chemical 2 of 41 results Feb 19, 2014 Feb 19, 2014

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 21–30 of 359 samples, newest first — collected October 25, 2023 to March 27, 2024. The summary above covers all 359.

54 results from the 10 samples listed here: 17 detected, 37 not detected. Across the whole record it is 482 of 2,029. 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 Town of Bolton, every result from 21 to 30 of 359 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
Mar 27, 2024 13:00
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-240328-038
Laboratory
MSDH Lab
8.91 ug/l , sample collected Mar 27, 2024 13:00, sampling point MRT000 TTHM 2950 EPA method 524.2 Not recorded
Collected
Mar 6, 2024 14:32
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
IN-240307-002
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 6, 2024 14:32, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0036 mg/l , sample collected Mar 6, 2024 14:32, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 6, 2024 14:32, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 6, 2024 14:32, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.483 mg/l , sample collected Mar 6, 2024 14:32, sampling point TF101 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 Mar 6, 2024 14:32, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 6, 2024 14:32, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Mar 6, 2024 14:32, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Mar 6, 2024 14:32, sampling point TF101 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 Mar 6, 2024 14:32, sampling point TF101 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 Mar 6, 2024 14:32, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 28, 2024 10:28
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
810-95673-2
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Feb 28, 2024 10:28, sampling point SM2 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
1 ug/l , sample collected Feb 28, 2024 10:28, sampling point SM2 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
1.5 ug/l , sample collected Feb 28, 2024 10:28, sampling point SM2 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 28, 2024 10:28, sampling point SM2 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 28, 2024 10:28, sampling point SM2 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
2.5 ug/l , sample collected Feb 28, 2024 10:28, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2024 – Mar 31, 2024
12 ug/l , sample collected Feb 28, 2024 10:28, sampling point SM2 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 28, 2024 10:28, sampling point SM2 Bromoform 2942 EPA method 524.2 Not recorded
1.5 ug/l , sample collected Feb 28, 2024 10:28, sampling point SM2 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 28, 2024 10:28, sampling point SM2 Dibromochloromethane 2944 EPA method 524.2 Not recorded
13.5 ug/l , sample collected Feb 28, 2024 10:28, sampling point SM2 TTHM 2950 EPA method 524.2 Jan 1, 2024 – Mar 31, 2024
Collected
Feb 28, 2024 10:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-95673-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Feb 28, 2024 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 Feb 28, 2024 10:00, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
1.5 ug/l , sample collected Feb 28, 2024 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 Feb 28, 2024 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 Feb 28, 2024 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 Feb 28, 2024 10:00, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2024 – Mar 31, 2024
12 ug/l , sample collected Feb 28, 2024 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 Feb 28, 2024 10:00, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
1.4 ug/l , sample collected Feb 28, 2024 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 Feb 28, 2024 10:00, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
13.4 ug/l , sample collected Feb 28, 2024 10:00, sampling point SM1 TTHM 2950 EPA method 524.2 Jan 1, 2024 – Mar 31, 2024
Collected
Feb 7, 2024 07:30
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-240207-061
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 07:30, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 07:30, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 07:30, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Feb 7, 2024 07:01
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-240207-062
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 07:01, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 07:01, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 7, 2024 07:01, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Feb 7, 2024 07:30
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NA-240208-018
Laboratory
MSDH Lab
86.6 mg/l , sample collected Feb 7, 2024 07:30, sampling point TF102 Sodium 1052 EPA method 200.7 Jan 1, 2022 – Dec 31, 2024
Collected
Feb 7, 2024 07:01
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NA-240208-017
Laboratory
MSDH Lab
83.5 mg/l , sample collected Feb 7, 2024 07:01, sampling point TF101 Sodium 1052 EPA method 200.7 Jan 1, 2022 – Dec 31, 2024
Collected
Nov 1, 2023 17:30
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
CN-231102-003
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Nov 1, 2023 17:30, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2021 – Dec 31, 2023
Collected
Oct 25, 2023 14:10
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
IN-231027-003
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 25, 2023 14:10, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.0033 mg/l , sample collected Oct 25, 2023 14:10, sampling point TF102 Barium 1010 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 25, 2023 14:10, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 25, 2023 14:10, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.459 mg/l , sample collected Oct 25, 2023 14:10, sampling point TF102 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2021 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 25, 2023 14:10, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 25, 2023 14:10, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Oct 25, 2023 14:10, sampling point TF102 Selenium 1045 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 25, 2023 14:10, sampling point TF102 Antimony, Total 1074 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 25, 2023 14:10, sampling point TF102 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Oct 25, 2023 14:10, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023

Routine (10).