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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

MS0140010 , Town of Lyon

26 of the 58 analytes this system has been tested for have been detected at least once, across 379 samples on record.

The other 32 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 379 samples on record, detections range from September 28, 1993 to September 30, 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 Lyon, 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
TTHM 2950 Organic Chemical 106 of 112 results Sep 15, 2004 Sep 24, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 100 of 107 results Sep 15, 2004 Sep 24, 2025
Copper, Free 1022 Inorganic Chemical 76 of 77 results Sep 28, 1993 Sep 30, 2025
Bromodichloromethane 2943 Organic Chemical 75 of 79 results May 16, 2006 May 19, 2020
Dibromochloromethane 2944 Organic Chemical 75 of 79 results May 16, 2006 May 19, 2020
Bromoform 2942 Organic Chemical 74 of 79 results May 16, 2006 May 19, 2020
Dibromoacetic Acid 2454 Organic Chemical 72 of 75 results Oct 11, 2007 May 19, 2020
Chloroform 2941 Organic Chemical 72 of 79 results May 16, 2006 May 19, 2020
Trichloroacetic Acid 2452 Organic Chemical 66 of 75 results Oct 11, 2007 May 19, 2020
Dichloroacetic Acid 2451 Organic Chemical 63 of 75 results Apr 28, 2008 May 19, 2020
Lead 1030 Inorganic Chemical 52 of 77 results Sep 28, 1993 Sep 30, 2025
Monobromoacetic Acid 2453 Organic Chemical 35 of 75 results Jan 29, 2008 Aug 15, 2019
Monochloroacetic Acid 2450 Organic Chemical 13 of 75 results Nov 18, 2009 May 19, 2020
Arsenic 1005 Inorganic Chemical 12 of 12 results Apr 9, 2002 Mar 12, 2025
Barium 1010 Inorganic Chemical 12 of 12 results Apr 9, 2002 Mar 12, 2025
Fluoride 1025 Inorganic Chemical 12 of 12 results Apr 9, 2002 Mar 12, 2025
Selenium 1045 Inorganic Chemical 12 of 12 results Apr 9, 2002 Mar 12, 2025
Chromium 1020 Inorganic Chemical 8 of 12 results Apr 9, 2002 May 11, 2022
Xylenes, Total 2955 Organic Chemical 8 of 33 results Jan 12, 2004 Apr 20, 2021
Thallium, Total 1085 Inorganic Chemical 2 of 12 results Feb 28, 2005 Apr 22, 2020
Gross Alpha Particle Activity 4109 Radionuclide 2 of 6 results Sep 28, 2011 Sep 12, 2012
Nitrite 1041 Inorganic Chemical 1 of 20 results Jan 10, 2022 Jan 10, 2022
Sodium 1052 Inorganic Chemical 1 of 1 result Sep 25, 2019 Sep 25, 2019
Gross Alpha, Excl. Radon & U 4000 Radionuclide 1 of 2 results Sep 28, 2011 Sep 28, 2011
Nickel 1036 Inorganic Chemical 1 of 12 results Mar 24, 2008 Mar 24, 2008
Mercury 1035 Inorganic Chemical 1 of 12 results Feb 28, 2005 Feb 28, 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 111–120 of 379 samples, newest first — collected August 15, 2017 to February 13, 2018. The summary above covers all 379.

53 results from the 10 samples listed here: 23 detected, 30 not detected. Across the whole record it is 952 of 1,981. 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 Lyon, every result from 111 to 120 of 379 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 13, 2018 12:50
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
180214-002TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 4 ug/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 TTHM 2950 Jan 1, 2018 – Mar 31, 2018
Collected
Feb 13, 2018 01:10
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
180214-001TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 4 ug/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 TTHM 2950 Jan 1, 2018 – Mar 31, 2018
Collected
Feb 13, 2018 12:50
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
180214-002HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 0.006 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 12:50, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2018 – Mar 31, 2018
Collected
Feb 13, 2018 01:10
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
180214-001HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 0.006 mg/l Minimum Reporting Level , sample collected Feb 13, 2018 01:10, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2018 – Mar 31, 2018
Collected
Jan 30, 2018 13:15
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
180131-023NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jan 30, 2018 13:15, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jan 30, 2018 13:15, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 30, 2018 13:15, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
Collected
Nov 14, 2017 12:55
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
171115-005TH
Laboratory
MSDH Lab
2.87 ug/l , sample collected Nov 14, 2017 12:55, sampling point SM2 Chloroform 2941 EPA method 524.2 Not recorded
45.4 ug/l , sample collected Nov 14, 2017 12:55, sampling point SM2 Bromoform 2942 EPA method 524.2 Not recorded
8.33 ug/l , sample collected Nov 14, 2017 12:55, sampling point SM2 Bromodichloromethane 2943 EPA method 524.2 Not recorded
25.3 ug/l , sample collected Nov 14, 2017 12:55, sampling point SM2 Dibromochloromethane 2944 EPA method 524.2 Not recorded
81.9 ug/l , sample collected Nov 14, 2017 12:55, sampling point SM2 TTHM 2950 Oct 1, 2017 – Dec 31, 2017
Collected
Nov 14, 2017 12:45
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
171115-004TH
Laboratory
MSDH Lab
2.8 ug/l , sample collected Nov 14, 2017 12:45, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
45.9 ug/l , sample collected Nov 14, 2017 12:45, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
8.01 ug/l , sample collected Nov 14, 2017 12:45, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
24.7 ug/l , sample collected Nov 14, 2017 12:45, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
81.4 ug/l , sample collected Nov 14, 2017 12:45, sampling point SM1 TTHM 2950 Oct 1, 2017 – Dec 31, 2017
Collected
Nov 14, 2017 12:55
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
171115-005HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Nov 14, 2017 12:55, sampling point SM2 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Nov 14, 2017 12:55, sampling point SM2 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Nov 14, 2017 12:55, sampling point SM2 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Nov 14, 2017 12:55, sampling point SM2 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
0.018 mg/l , sample collected Nov 14, 2017 12:55, sampling point SM2 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.022 mg/l , sample collected Nov 14, 2017 12:55, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 Oct 1, 2017 – Dec 31, 2017
Collected
Nov 14, 2017 12:45
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
171115-004HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Nov 14, 2017 12:45, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Nov 14, 2017 12:45, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Nov 14, 2017 12:45, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Nov 14, 2017 12:45, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
0.019 mg/l , sample collected Nov 14, 2017 12:45, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.023 mg/l , sample collected Nov 14, 2017 12:45, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 Oct 1, 2017 – Dec 31, 2017
Collected
Aug 15, 2017 13:00
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
170816-006HA
Laboratory
MSDH Lab
0.003 mg/l , sample collected Aug 15, 2017 13:00, sampling point SM2 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.001 mg/l , sample collected Aug 15, 2017 13:00, sampling point SM2 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.001 mg/l , sample collected Aug 15, 2017 13:00, sampling point SM2 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Aug 15, 2017 13:00, sampling point SM2 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
0.008 mg/l , sample collected Aug 15, 2017 13:00, sampling point SM2 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.013 mg/l , sample collected Aug 15, 2017 13:00, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 Jul 1, 2017 – Sep 30, 2017

Routine (10).