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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

MS0030001 , Coles Water Association #1

18 of the 55 analytes this system has been tested for have been detected at least once, across 158 samples on record.

The other 37 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 158 samples on record, detections range from April 14, 1994 to July 22, 2025. 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 Coles Water Association #1, 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
Lead 1030 Inorganic Chemical 56 of 71 results Apr 14, 1994 Aug 13, 2024
Copper, Free 1022 Inorganic Chemical 51 of 71 results Apr 14, 1994 Aug 13, 2024
TTHM 2950 Organic Chemical 7 of 26 results May 3, 2004 Jul 22, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 6 of 27 results Jun 25, 2007 Mar 5, 2025
Bromodichloromethane 2943 Organic Chemical 5 of 20 results Jun 25, 2007 Jul 22, 2025
Dibromochloromethane 2944 Organic Chemical 5 of 20 results Jun 25, 2007 Jul 22, 2025
Arsenic 1005 Inorganic Chemical 5 of 5 results Apr 21, 2011 Jan 10, 2024
Barium 1010 Inorganic Chemical 5 of 5 results Apr 21, 2011 Jan 10, 2024
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 5 results Dec 5, 2011 Jul 10, 2012
Combined Radium (-226 & -228) 4010 Radionuclide 5 of 5 results Dec 5, 2011 Jul 10, 2012
Radium-226 4020 Radionuclide 5 of 5 results Dec 5, 2011 Jul 10, 2012
Chloroform 2941 Organic Chemical 4 of 20 results Jun 25, 2007 Jul 22, 2025
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 18, 2019 Oct 16, 2024
Nickel 1036 Inorganic Chemical 2 of 5 results May 5, 2014 Jan 10, 2024
Monochloroacetic Acid 2450 Organic Chemical 2 of 20 results Mar 12, 2019 Apr 16, 2019
Fluoride 1025 Inorganic Chemical 1 of 5 results Jan 10, 2024 Jan 10, 2024
Chromium 1020 Inorganic Chemical 1 of 5 results May 5, 2014 May 5, 2014
Monobromoacetic Acid 2453 Organic Chemical 1 of 20 results Jun 8, 2010 Jun 8, 2010

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 31–40 of 158 samples, newest first — collected June 22, 2021 to February 1, 2022. The summary above covers all 158.

17 results from the 10 samples listed here: 10 detected, 7 not detected. Across the whole record it is 169 of 699. 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 5 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 Coles Water Association #1, every result from 31 to 40 of 158 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, 2022 13:30
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-220202-005
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 1, 2022 13:30, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2022 – Dec 31, 2022
Collected
Feb 1, 2022 13:35
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-220202-005
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 1, 2022 13:35, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2022 – Dec 31, 2022
Collected
Jan 11, 2022 12:15
Sampling point
TF080 Treatment Plantt080
Sample type
Routine
Lab sample
NI-220112-036
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 11, 2022 12:15, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2022 – Dec 31, 2022
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 11, 2022 12:15, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2022 – Dec 31, 2022
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 11, 2022 12:15, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2022 – Dec 31, 2022
Collected
Jun 23, 2021 08:00
Sampling point
LC0007 Location withheld
Sample type
Routine
Lab sample
PB-210624-082
Laboratory
MSDH Lab
0.0228 mg/l , sample collected Jun 23, 2021 08:00, sampling point LC0007 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 23, 2021 08:00, sampling point LC0007 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jun 23, 2021 08:10
Sampling point
LC0003 Location withheld
Sample type
Routine
Lab sample
PB-210624-084
Laboratory
MSDH Lab
0.111 mg/l , sample collected Jun 23, 2021 08:10, sampling point LC0003 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
0.8 ug/l , sample collected Jun 23, 2021 08:10, sampling point LC0003 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jun 23, 2021 08:30
Sampling point
LC0001 Location withheld
Sample type
Routine
Lab sample
PB-210624-083
Laboratory
MSDH Lab
0.0972 mg/l , sample collected Jun 23, 2021 08:30, sampling point LC0001 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
1.3 ug/l , sample collected Jun 23, 2021 08:30, sampling point LC0001 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jun 23, 2021 08:45
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-210624-085
Laboratory
MSDH Lab
0.024 mg/l , sample collected Jun 23, 2021 08:45, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
0.5 ug/l , sample collected Jun 23, 2021 08:45, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jun 23, 2021 09:00
Sampling point
LC0005 Location withheld
Sample type
Routine
Lab sample
PB-210624-086
Laboratory
MSDH Lab
0.0501 mg/l , sample collected Jun 23, 2021 09:00, sampling point LC0005 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
0.9 ug/l , sample collected Jun 23, 2021 09:00, sampling point LC0005 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jun 22, 2021 12:55
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-210623-002
Laboratory
MSDH Lab
6.74 ug/l , sample collected Jun 22, 2021 12:55, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2021 – Dec 31, 2021
Collected
Jun 22, 2021 12:55
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-210623-001
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 22, 2021 12:55, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2021 – Dec 31, 2021

Routine (10).