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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

MS0410013 , Town of Shannon

35 of the 72 analytes this system has been tested for have been detected at least once, across 256 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 256 samples on record, detections range from November 24, 2003 to November 17, 2025. 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 Town of Shannon, 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 67 of 67 results Sep 12, 2007 Jul 22, 2025
Lead 1030 Inorganic Chemical 47 of 67 results Sep 12, 2007 Jul 22, 2025
Barium 1010 Inorganic Chemical 25 of 25 results Nov 24, 2003 Mar 10, 2025
Chromium 1020 Inorganic Chemical 21 of 25 results Nov 24, 2003 Jan 10, 2024
Nickel 1036 Inorganic Chemical 16 of 25 results Nov 29, 2004 Mar 10, 2025
Fluoride 1025 Inorganic Chemical 14 of 26 results Nov 24, 2003 Mar 10, 2025
Selenium 1045 Inorganic Chemical 10 of 25 results Nov 24, 2003 Mar 27, 2006
Arsenic 1005 Inorganic Chemical 7 of 25 results Nov 29, 2004 Mar 10, 2025
Nitrite 1041 Inorganic Chemical 5 of 53 results Feb 20, 2013 Mar 10, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 10 results Mar 29, 2012 Oct 3, 2012
TTHM 2950 Organic Chemical 4 of 22 results Oct 16, 2007 Nov 17, 2025
Sodium 1052 Inorganic Chemical 4 of 4 results May 11, 2016 Feb 10, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 3 of 21 results Jun 8, 2010 May 26, 2022
Thallium, Total 1085 Inorganic Chemical 3 of 25 results Mar 30, 2005 Apr 28, 2020
Cyanide 1024 Inorganic Chemical 3 of 23 results Dec 20, 2005 May 22, 2017
Sulfate 1055 Inorganic Chemical 3 of 3 results Nov 24, 2003 May 11, 2016
Bromoform 2942 Organic Chemical 2 of 17 results Sep 30, 2020 Nov 17, 2025
Nitrate-Nitrite 1038 Inorganic Chemical 2 of 53 results Mar 10, 2025 Mar 10, 2025
Xylenes, Total 2955 Organic Chemical 2 of 31 results Feb 16, 2005 May 11, 2006
Cadmium 1015 Inorganic Chemical 2 of 25 results Mar 2, 2005 Mar 2, 2005
Dibromochloromethane 2944 Organic Chemical 1 of 17 results Nov 17, 2025 Nov 17, 2025
Monochloroacetic Acid 2450 Organic Chemical 1 of 15 results Aug 12, 2019 Aug 12, 2019
Calcium 1016 Inorganic Chemical 1 of 1 result May 11, 2016 May 11, 2016
Chloride 1017 Inorganic Chemical 1 of 1 result May 11, 2016 May 11, 2016
Magnesium 1031 Inorganic Chemical 1 of 1 result May 11, 2016 May 11, 2016
Manganese 1032 Inorganic Chemical 1 of 1 result May 11, 2016 May 11, 2016
Potassium 1042 Inorganic Chemical 1 of 1 result May 11, 2016 May 11, 2016
Residue, Total, Filterable 1057 Water Quality 1 of 1 result May 11, 2016 May 11, 2016
Carbon Dioxide 1901 Water Quality 1 of 1 result May 11, 2016 May 11, 2016
Color 1905 Water Quality 1 of 1 result May 11, 2016 May 11, 2016
Hardness, Total (As Caco3) 1915 Water Quality 1 of 1 result May 11, 2016 May 11, 2016
Alkalinity, Total 1927 Water Quality 1 of 1 result May 11, 2016 May 11, 2016
Calculated Sodium NACA Water Quality 1 of 1 result May 11, 2016 May 11, 2016
PH, Field Result PHFD Water Quality 1 of 1 result May 11, 2016 May 11, 2016
Ethylbenzene 2992 Organic Chemical 1 of 31 results Feb 16, 2005 Feb 16, 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

Choose a date range

The most recent samples, result by result

The table below lists 1–10 of 23 samples, newest first — collected July 22, 2025 to March 3, 2026. The summary above covers all 23.

33 results from the 10 samples listed here: 11 detected, 22 not detected. Across the whole record it is 260 of 1,503. 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 6 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 Shannon, every result from 1 to 10 of 23 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 3, 2026 13:20
Sampling point
TF103
Sample type
Routine
Lab sample
NI-260304-004
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 3, 2026 13:20, sampling point TF103 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 3, 2026 13:20, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2026 – Dec 31, 2026
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 3, 2026 13:20, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2026 – Dec 31, 2026
Collected
Mar 3, 2026 13:30
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-260304-003
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 3, 2026 13:30, 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 3, 2026 13:30, 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 3, 2026 13:30, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2026 – Dec 31, 2026
Collected
Nov 17, 2025 09:35
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-172244-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2025 09:35, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
3.7 ug/l , sample collected Nov 17, 2025 09:35, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Nov 17, 2025 09:35, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
1 ug/l , sample collected Nov 17, 2025 09:35, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
4.7 ug/l , sample collected Nov 17, 2025 09:35, sampling point SM1 TTHM 2950 EPA method 524.2 Not recorded
Collected
Oct 22, 2025 09:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-169098-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Oct 22, 2025 09:00, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 22, 2025 09:00, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 22, 2025 09:00, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 22, 2025 09:00, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 22, 2025 09:00, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Oct 22, 2025 09:00, 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 Oct 22, 2025 09:00, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 22, 2025 09:00, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 22, 2025 09:00, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 22, 2025 09:00, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 22, 2025 09:00, sampling point SM1 TTHM 2950 EPA method 524.2 Not recorded
Collected
Sep 2, 2025 10:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
CN-250903-038
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 2, 2025 10:00, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Jul 22, 2025 10:00
Sampling point
LC006 Location withheld
Sample type
Routine
Lab sample
PB-250723-026
Laboratory
MSDH Lab
0.022 mg/l , sample collected Jul 22, 2025 10:00, sampling point LC006 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
1.3 ug/l , sample collected Jul 22, 2025 10:00, sampling point LC006 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 22, 2025 09:50
Sampling point
LC023 Location withheld
Sample type
Routine
Lab sample
PB-250723-027
Laboratory
MSDH Lab
0.0093 mg/l , sample collected Jul 22, 2025 09:50, sampling point LC023 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 22, 2025 09:50, sampling point LC023 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 22, 2025 09:40
Sampling point
LC018 Location withheld
Sample type
Routine
Lab sample
PB-250723-028
Laboratory
MSDH Lab
0.0467 mg/l , sample collected Jul 22, 2025 09:40, sampling point LC018 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 22, 2025 09:40, sampling point LC018 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 22, 2025 09:35
Sampling point
LC011 Location withheld
Sample type
Routine
Lab sample
PB-250723-029
Laboratory
MSDH Lab
0.0338 mg/l , sample collected Jul 22, 2025 09:35, sampling point LC011 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
6.3 ug/l , sample collected Jul 22, 2025 09:35, sampling point LC011 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jul 22, 2025 09:30
Sampling point
LC009 Location withheld
Sample type
Routine
Lab sample
PB-250723-030
Laboratory
MSDH Lab
0.0084 mg/l , sample collected Jul 22, 2025 09:30, sampling point LC009 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
2.3 ug/l , sample collected Jul 22, 2025 09:30, sampling point LC009 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025

Routine (10).