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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.

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

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 101–110 of 256 samples, newest first — collected March 25, 2015 to March 6, 2017. The summary above covers all 256.

55 results from the 10 samples listed here: 17 detected, 38 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.

Chemical and radiological sample results for Town of Shannon, every result from 101 to 110 of 256 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 6, 2017 13:20
Sampling point
TF103
Sample type
Routine
Lab sample
170307-020NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 6, 2017 13:20, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 6, 2017 13:20, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 6, 2017 13:20, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2017 – Dec 31, 2017
Collected
May 11, 2016
Sampling point
WL003
Sample type
Routine
Lab sample
160513-004PC
Laboratory
MSDH Lab
12.8 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Calcium 1016 EPA method 200.8 Not recorded
29.961 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Chloride 1017 EPA method 300.0 Not recorded
0.086 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Fluoride 1025 EPA method 380-75WE Not recorded
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 11, 2016, sampling point WL003 Iron 1028 EPA method 200.8 Not recorded
2.41 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Magnesium 1031 EPA method 200.8 Not recorded
0.042 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Manganese 1032 EPA method 200.8 Not recorded
2.79 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Potassium 1042 EPA method 200.8 Not recorded
44.6 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Sodium 1052 EPA method 200.8 Not recorded
6.267 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Sulfate 1055 EPA method 300.0 Not recorded
154 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Residue, Total, Filterable 1057 EPA method CALCUL LAB Not recorded
1 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Carbon Dioxide 1901 EPA method CALCUL LAB Not recorded
5 units The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Color 1905 EPA method 2120B Not recorded
41.9 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Hardness, Total (As Caco3) 1915 EPA method CALCUL LAB Not recorded
94.5 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Alkalinity, Total 1927 EPA method 2320B Not recorded
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected May 11, 2016, sampling point WL003 Iron, Field Result FEFD EPA method 3500AL-D Not recorded
42 mg/l The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 Calculated Sodium NACA EPA method CALCUL LAB Not recorded
8.2 ph The agency recorded which kind of limit this result was below, but stored 0.000000000 as the limit itself, which is not a level. The type is published and the value is null. What the limit was is not on record. Whether the result was a detection is a separate column: read resultType. , sample collected May 11, 2016, sampling point WL003 PH, Field Result PHFD EPA method 3500AL-D Not recorded
Collected
Apr 19, 2016 14:20
Sampling point
TF103
Sample type
Routine
Lab sample
160420-050NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 19, 2016 14:20, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 19, 2016 14:20, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 19, 2016 14:20, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Collected
Apr 19, 2016 14:10
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
160420-043NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 19, 2016 14:10, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 19, 2016 14:10, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 19, 2016 14:10, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2016 – Dec 31, 2016
Collected
Jul 6, 2015 01:15
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
150707-027TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 6, 2015 01:15, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 6, 2015 01:15, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 6, 2015 01:15, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 6, 2015 01:15, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 4 ug/l Minimum Reporting Level , sample collected Jul 6, 2015 01:15, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2014 – Dec 31, 2016
Collected
Jul 6, 2015 01:20
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
150707-023HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Jul 6, 2015 01:20, 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 6, 2015 01:20, 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 6, 2015 01:20, 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 6, 2015 01:20, 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 6, 2015 01:20, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 0.006 mg/l Minimum Reporting Level , sample collected Jul 6, 2015 01:20, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2014 – Dec 31, 2016
Collected
May 18, 2015 01:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
150519-034CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 18, 2015 01:00, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2014 – Dec 31, 2016
Collected
Apr 20, 2015 01:00
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
150421-019IN
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 01:00, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.1189 mg/l , sample collected Apr 20, 2015 01:00, sampling point TF102 Barium 1010 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 01:00, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
0.0019 mg/l , sample collected Apr 20, 2015 01:00, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 01:00, sampling point TF102 Fluoride 1025 EPA method 300.0 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 01:00, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 01:00, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 01:00, sampling point TF102 Selenium 1045 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 01:00, sampling point TF102 Antimony, Total 1074 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 01:00, sampling point TF102 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 20, 2015 01:00, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2014 – Dec 31, 2016
Collected
Mar 25, 2015 13:15
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
150326-040NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 25, 2015 13:15, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 25, 2015 13:15, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 25, 2015 13:15, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Collected
Mar 25, 2015 13:25
Sampling point
TF103
Sample type
Routine
Lab sample
150326-030NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 25, 2015 13:25, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 25, 2015 13:25, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 25, 2015 13:25, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2015 – Dec 31, 2015

Routine (10).