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.
| 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 71–80 of 256 samples, newest first — collected April 9, 2019 to February 22, 2021. The summary above covers all 256.
44 results from the 10 samples listed here: 10 detected, 34 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.
| Result | Analyte | Monitoring period |
|---|---|---|
|
||
| Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Feb 22, 2021 13:15, sampling point TF103 | Cyanide 1024 EPA method QC10204001X | Jan 1, 2019 – Dec 31, 2021 |
|
||
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 30, 2020 13:10, sampling point MRT000 | Chloroform 2941 EPA method 524.2 | Not recorded |
| 2.64 ug/l , sample collected Sep 30, 2020 13:10, sampling point MRT000 | Bromoform 2942 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 30, 2020 13:10, sampling point MRT000 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Sep 30, 2020 13:10, sampling point MRT000 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| 2.64 ug/l , sample collected Sep 30, 2020 13:10, sampling point MRT000 | TTHM 2950 | Jan 1, 2020 – Dec 31, 2020 |
|
||
| Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Sep 30, 2020 13:20, sampling point MRT000 | Monochloroacetic Acid 2450 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 30, 2020 13:20, sampling point MRT000 | Dichloroacetic Acid 2451 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 30, 2020 13:20, sampling point MRT000 | Trichloroacetic Acid 2452 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 30, 2020 13:20, sampling point MRT000 | Monobromoacetic Acid 2453 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 30, 2020 13:20, sampling point MRT000 | Dibromoacetic Acid 2454 EPA method 552.2 | Not recorded |
| Not detected below 0.006 mg/l Minimum Reporting Level , sample collected Sep 30, 2020 13:20, sampling point MRT000 | Total Haloacetic Acids (Haa5) 2456 | Jan 1, 2020 – Dec 31, 2020 |
|
||
| 0.0013 mg/l , sample collected Apr 28, 2020 13:00, sampling point TF103 | Arsenic 1005 EPA method 200.8 | Jan 1, 2019 – Dec 31, 2021 |
| 0.1128 mg/l , sample collected Apr 28, 2020 13:00, sampling point TF103 | Barium 1010 EPA method 200.8 | Jan 1, 2019 – Dec 31, 2021 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 28, 2020 13:00, sampling point TF103 | Cadmium 1015 EPA method 200.8 | Jan 1, 2019 – Dec 31, 2021 |
| 0.0008 mg/l , sample collected Apr 28, 2020 13:00, sampling point TF103 | Chromium 1020 EPA method 200.8 | Jan 1, 2019 – Dec 31, 2021 |
| 0.113 mg/l , sample collected Apr 28, 2020 13:00, sampling point TF103 | Fluoride 1025 EPA method QC 10-109-12-2-A | Jan 1, 2019 – Dec 31, 2021 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 28, 2020 13:00, sampling point TF103 | Mercury 1035 EPA method 200.8 | Jan 1, 2019 – Dec 31, 2021 |
| 0.0009 mg/l , sample collected Apr 28, 2020 13:00, sampling point TF103 | Nickel 1036 EPA method 200.8 | Not recorded |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 28, 2020 13:00, sampling point TF103 | Selenium 1045 EPA method 200.8 | Jan 1, 2019 – Dec 31, 2021 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 28, 2020 13:00, sampling point TF103 | Antimony, Total 1074 EPA method 200.8 | Jan 1, 2019 – Dec 31, 2021 |
| Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 28, 2020 13:00, sampling point TF103 | Beryllium, Total 1075 EPA method 200.8 | Jan 1, 2019 – Dec 31, 2021 |
| 0.0007 mg/l , sample collected Apr 28, 2020 13:00, sampling point TF103 | Thallium, Total 1085 EPA method 200.8 | Jan 1, 2019 – Dec 31, 2021 |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 17, 2020 13:15, sampling point TF102 | Nitrate-Nitrite 1038 EPA method QC10107041C | Jan 1, 2020 – Dec 31, 2020 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 17, 2020 13:15, sampling point TF102 | Nitrate 1040 EPA method QC10107041C | Jan 1, 2020 – Dec 31, 2020 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 17, 2020 13:15, sampling point TF102 | Nitrite 1041 EPA method QC10107041C | Jan 1, 2020 – Dec 31, 2020 |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Mar 17, 2020 13:00, sampling point TF103 | Nitrate-Nitrite 1038 EPA method QC10107041C | Jan 1, 2020 – Dec 31, 2020 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Mar 17, 2020 13:00, sampling point TF103 | Nitrate 1040 EPA method QC10107041C | Jan 1, 2020 – Dec 31, 2020 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Mar 17, 2020 13:00, sampling point TF103 | Nitrite 1041 EPA method QC10107041C | Jan 1, 2020 – Dec 31, 2020 |
|
||
| Not detected below 1.7 mfl Minimum Reporting Level , sample collected Sep 9, 2019, sampling point DS000 | Asbestos 1094 EPA method 100.2 | Not recorded |
|
||
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 12, 2019 01:25, sampling point MRT000 | Chloroform 2941 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 12, 2019 01:25, sampling point MRT000 | Bromoform 2942 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 12, 2019 01:25, sampling point MRT000 | Bromodichloromethane 2943 EPA method 524.2 | Not recorded |
| Not detected below 1 ug/l Minimum Reporting Level , sample collected Aug 12, 2019 01:25, sampling point MRT000 | Dibromochloromethane 2944 EPA method 524.2 | Not recorded |
| Not detected below 4 ug/l Minimum Reporting Level , sample collected Aug 12, 2019 01:25, sampling point MRT000 | TTHM 2950 | Jan 1, 2019 – Dec 31, 2019 |
|
||
| 0.007 mg/l , sample collected Aug 12, 2019 01:10, sampling point MRT000 | Monochloroacetic Acid 2450 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 12, 2019 01:10, sampling point MRT000 | Dichloroacetic Acid 2451 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 12, 2019 01:10, sampling point MRT000 | Trichloroacetic Acid 2452 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 12, 2019 01:10, sampling point MRT000 | Monobromoacetic Acid 2453 EPA method 552.2 | Not recorded |
| Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 12, 2019 01:10, sampling point MRT000 | Dibromoacetic Acid 2454 EPA method 552.2 | Not recorded |
| 0.007 mg/l , sample collected Aug 12, 2019 01:10, sampling point MRT000 | Total Haloacetic Acids (Haa5) 2456 | Jan 1, 2019 – Dec 31, 2019 |
|
||
| Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 9, 2019 12:30, sampling point TF102 | Nitrate-Nitrite 1038 EPA method QC10107041C | Jan 1, 2019 – Dec 31, 2019 |
| Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Apr 9, 2019 12:30, sampling point TF102 | Nitrate 1040 EPA method QC10107041C | Jan 1, 2019 – Dec 31, 2019 |
| Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Apr 9, 2019 12:30, sampling point TF102 | Nitrite 1041 EPA method QC10107041C | Jan 1, 2019 – Dec 31, 2019 |
-
- Collected
- Feb 22, 2021 13:15
- Sampling point
- TF103
- Sample type
- Routine
- Lab sample
- CN-210223-004
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
Cyanide 1024 EPA method QC10204001X
- Result
- Not detected below 0.015 mg/l Minimum Reporting Level
-
- Collected
- Sep 30, 2020 13:10
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 201001-012TH
- Laboratory
- MSDH Lab
-
Chloroform 2941 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Bromoform 2942 EPA method 524.2
- Result
- 2.64 ug/l
- Monitoring period
- Not recorded
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
TTHM 2950
- Result
- 2.64 ug/l
- Monitoring period
- Jan 1, 2020 – Dec 31, 2020
-
- Collected
- Sep 30, 2020 13:20
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 201001-012HA
- Laboratory
- MSDH Lab
-
Monochloroacetic Acid 2450 EPA method 552.2
- Result
- Not detected below 0.002 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dichloroacetic Acid 2451 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Trichloroacetic Acid 2452 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Monobromoacetic Acid 2453 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromoacetic Acid 2454 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456
- Result
- Not detected below 0.006 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2020 – Dec 31, 2020
-
- Collected
- Apr 28, 2020 13:00
- Sampling point
- TF103
- Sample type
- Routine
- Lab sample
- 200429-033IN
- Laboratory
- MSDH Lab
-
Arsenic 1005 EPA method 200.8
- Result
- 0.0013 mg/l
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
Barium 1010 EPA method 200.8
- Result
- 0.1128 mg/l
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
Cadmium 1015 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
Chromium 1020 EPA method 200.8
- Result
- 0.0008 mg/l
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
Fluoride 1025 EPA method QC 10-109-12-2-A
- Result
- 0.113 mg/l
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
Mercury 1035 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
Nickel 1036 EPA method 200.8
- Result
- 0.0009 mg/l
- Monitoring period
- Not recorded
-
Selenium 1045 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
Antimony, Total 1074 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
Beryllium, Total 1075 EPA method 200.8
- Result
- Not detected below 0.0005 mg/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
Thallium, Total 1085 EPA method 200.8
- Result
- 0.0007 mg/l
- Monitoring period
- Jan 1, 2019 – Dec 31, 2021
-
- Collected
- Mar 17, 2020 13:15
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- 200318-032NI
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2020 – Dec 31, 2020
-
Nitrate-Nitrite 1038 EPA method QC10107041C
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
Nitrate 1040 EPA method QC10107041C
- Result
- Not detected below 0.08 mg/l Minimum Reporting Level
-
Nitrite 1041 EPA method QC10107041C
- Result
- Not detected below 0.02 mg/l Minimum Reporting Level
-
- Collected
- Mar 17, 2020 13:00
- Sampling point
- TF103
- Sample type
- Routine
- Lab sample
- 200318-031NI
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2020 – Dec 31, 2020
-
Nitrate-Nitrite 1038 EPA method QC10107041C
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
Nitrate 1040 EPA method QC10107041C
- Result
- Not detected below 0.08 mg/l Minimum Reporting Level
-
Nitrite 1041 EPA method QC10107041C
- Result
- Not detected below 0.02 mg/l Minimum Reporting Level
-
- Collected
- Sep 9, 2019
- Sampling point
- DS000 Distribution
- Sample type
- Routine
- Lab sample
- 041923726-0001
- Laboratory
- Emsl Analytical, Inc.
- Monitoring period
- Not recorded
-
Asbestos 1094 EPA method 100.2
- Result
- Not detected below 1.7 mfl Minimum Reporting Level
-
- Collected
- Aug 12, 2019 01:25
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 190813-002TH
- Laboratory
- MSDH Lab
-
Chloroform 2941 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Bromoform 2942 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Bromodichloromethane 2943 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromochloromethane 2944 EPA method 524.2
- Result
- Not detected below 1 ug/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
TTHM 2950
- Result
- Not detected below 4 ug/l Minimum Reporting Level
- Monitoring period
- Jan 1, 2019 – Dec 31, 2019
-
- Collected
- Aug 12, 2019 01:10
- Sampling point
- MRT000 Max. Res. Time
- Sample type
- Routine
- Lab sample
- 190813-002HA
- Laboratory
- MSDH Lab
-
Monochloroacetic Acid 2450 EPA method 552.2
- Result
- 0.007 mg/l
- Monitoring period
- Not recorded
-
Dichloroacetic Acid 2451 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Trichloroacetic Acid 2452 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Monobromoacetic Acid 2453 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Dibromoacetic Acid 2454 EPA method 552.2
- Result
- Not detected below 0.001 mg/l Minimum Reporting Level
- Monitoring period
- Not recorded
-
Total Haloacetic Acids (Haa5) 2456
- Result
- 0.007 mg/l
- Monitoring period
- Jan 1, 2019 – Dec 31, 2019
-
- Collected
- Apr 9, 2019 12:30
- Sampling point
- TF102 Treatment Plant T102
- Sample type
- Routine
- Lab sample
- 190410-039NI
- Laboratory
- MSDH Lab
- Monitoring period
- Jan 1, 2019 – Dec 31, 2019
-
Nitrate-Nitrite 1038 EPA method QC10107041C
- Result
- Not detected below 0.1 mg/l Minimum Reporting Level
-
Nitrate 1040 EPA method QC10107041C
- Result
- Not detected below 0.08 mg/l Minimum Reporting Level
-
Nitrite 1041 EPA method QC10107041C
- Result
- Not detected below 0.02 mg/l Minimum Reporting Level
Routine (10).