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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 341–350 of 379 samples, newest first — collected June 12, 1996 to January 12, 2004. The summary above covers all 379.

58 results from the 10 samples listed here: 21 detected, 37 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.

Chemical and radiological sample results for Town of Lyon, every result from 341 to 350 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
Jan 12, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
040113-073VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 1,2,4-Trichlorobenzene 2378 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Cis-1,2-Dichloroethylene 2380 Jan 1, 2004 – Mar 31, 2004
2.2 ug/l , sample collected Jan 12, 2004, sampling point TF101 Xylenes, Total 2955 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Dichloromethane 2964 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 O-Dichlorobenzene 2968 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 P-Dichlorobenzene 2969 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Vinyl Chloride 2976 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 1,1-Dichloroethylene 2977 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Trans-1,2-Dichloroethylene 2979 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 1,2-Dichloroethane 2980 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 1,1,1-Trichloroethane 2981 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Carbon Tetrachloride 2982 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 1,2-Dichloropropane 2983 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Trichloroethylene 2984 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 1,1,2-Trichloroethane 2985 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Tetrachloroethylene 2987 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Chlorobenzene 2989 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Benzene 2990 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Toluene 2991 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Ethylbenzene 2992 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 12, 2004, sampling point TF101 Styrene 2996 Jan 1, 2004 – Mar 31, 2004
Collected
Sep 8, 2003
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
030909-060CN
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Sep 8, 2003, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2002 – Dec 31, 2004
Collected
Sep 8, 2003
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
030909-002IN
Laboratory
MSDH Lab
0.001 mg/l , sample collected Sep 8, 2003, sampling point TF101 Arsenic 1005 EPA method 200.8 Not recorded
0.009 mg/l , sample collected Sep 8, 2003, sampling point TF101 Barium 1010 EPA method 200.8 Not recorded
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Sep 8, 2003, sampling point TF101 Cadmium 1015 EPA method 200.8 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 8, 2003, sampling point TF101 Chromium 1020 EPA method 200.8 Not recorded
0.319 mg/l , sample collected Sep 8, 2003, sampling point TF101 Fluoride 1025 EPA method 300.0 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 8, 2003, sampling point TF101 Mercury 1035 EPA method 200.8 Not recorded
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Sep 8, 2003, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
0.003 mg/l , sample collected Sep 8, 2003, sampling point TF101 Selenium 1045 EPA method 200.8 Not recorded
Not detected below 2.5 mg/l Minimum Reporting Level , sample collected Sep 8, 2003, sampling point TF101 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 8, 2003, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Not recorded
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Sep 8, 2003, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 8, 2003, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Not recorded
Collected
Apr 9, 2002
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
020410-025IN
Laboratory
MSDH Lab
0.001 mg/l , sample collected Apr 9, 2002, sampling point TF101 Arsenic 1005 EPA method 200.8 Not recorded
0.01 mg/l , sample collected Apr 9, 2002, sampling point TF101 Barium 1010 EPA method 200.8 Not recorded
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Apr 9, 2002, sampling point TF101 Cadmium 1015 EPA method 200.8 Not recorded
0.005 mg/l , sample collected Apr 9, 2002, sampling point TF101 Chromium 1020 EPA method 200.8 Not recorded
0.302 mg/l , sample collected Apr 9, 2002, sampling point TF101 Fluoride 1025 EPA method 300.0 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2002, sampling point TF101 Mercury 1035 EPA method 200.8 Not recorded
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Apr 9, 2002, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
0.005 mg/l , sample collected Apr 9, 2002, sampling point TF101 Selenium 1045 EPA method 200.8 Not recorded
Not detected below 2.5 mg/l Minimum Reporting Level , sample collected Apr 9, 2002, sampling point TF101 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Apr 9, 2002, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Not recorded
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Apr 9, 2002, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Apr 9, 2002, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Not recorded
Collected
Aug 14, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000815-014L
Laboratory
MSDH Lab
0.694 mg/l , sample collected Aug 14, 2000, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Aug 14, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 14, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000815-013L
Laboratory
MSDH Lab
0.22 mg/l , sample collected Aug 14, 2000, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Aug 14, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 14, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000815-012L
Laboratory
MSDH Lab
0.83 mg/l , sample collected Aug 14, 2000, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Aug 14, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 14, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000815-011L
Laboratory
MSDH Lab
0.192 mg/l , sample collected Aug 14, 2000, sampling point DS000 Copper, Free 1022 Not recorded
0.003 mg/l , sample collected Aug 14, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 14, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000815-010L
Laboratory
MSDH Lab
0.893 mg/l , sample collected Aug 14, 2000, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Aug 14, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Jun 12, 1996
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
960613-156L
Laboratory
MSDH Lab
0.262 mg/l , sample collected Jun 12, 1996, sampling point DS000 Copper, Free 1022 Not recorded
0.003 mg/l , sample collected Jun 12, 1996, sampling point DS000 Lead 1030 Not recorded

Routine (10).