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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 311–320 of 379 samples, newest first — collected May 24, 2005 to November 3, 2005. The summary above covers all 379.

72 results from the 10 samples listed here: 5 detected, 67 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.

Units in this table

Xylenes, Total is recorded on this page in ug/l and mg/l. 1 mg/l = 1,000 ug/l.

Chemical and radiological sample results for Town of Lyon, every result from 311 to 320 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
Nov 3, 2005
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
051104-005VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Benzene 2990 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Toluene 2991 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Nov 3, 2005, sampling point TF101 Styrene 2996 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Collected
Oct 13, 2005
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
051014-003HA
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Oct 13, 2005, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2005 – Dec 31, 2005
Collected
Oct 13, 2005
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
051014-003TH
Laboratory
MSDH Lab
30.1 ug/l , sample collected Oct 13, 2005, sampling point MRT000 TTHM 2950 EPA method 524.2 Oct 1, 2005 – Dec 31, 2005
Collected
Sep 22, 2005
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
050923-007HA
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Sep 22, 2005, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jul 1, 2005 – Sep 30, 2005
Collected
Sep 22, 2005
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
050923-007TH
Laboratory
MSDH Lab
23 ug/l , sample collected Sep 22, 2005, sampling point MRT000 TTHM 2950 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Collected
Aug 30, 2005
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
050831-003VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Benzene 2990 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Toluene 2991 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Aug 30, 2005, sampling point TF101 Styrene 2996 EPA method 524.2 Jul 1, 2005 – Sep 30, 2005
Collected
Jul 20, 2005
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
050721-016NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Jul 20, 2005, sampling point TF101 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2005 – Dec 31, 2005
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Jul 20, 2005, sampling point TF101 Nitrate 1040 EPA method 353.2 Jan 1, 2005 – Dec 31, 2005
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jul 20, 2005, sampling point TF101 Nitrite 1041 EPA method 353.2 Jan 1, 2005 – Dec 31, 2005
Collected
Jun 22, 2005
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
050623-001HA
Laboratory
MSDH Lab
0.012 mg/l , sample collected Jun 22, 2005, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Apr 1, 2005 – Jun 30, 2005
Collected
May 24, 2005
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
050525-015TH
Laboratory
MSDH Lab
79.6 ug/l , sample collected May 24, 2005, sampling point MRT000 TTHM 2950 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Collected
May 24, 2005
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
050525-016VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
1.86 ug/l , sample collected May 24, 2005, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Benzene 2990 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Toluene 2991 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected May 24, 2005, sampling point TF101 Styrene 2996 EPA method 524.2 Apr 1, 2005 – Jun 30, 2005

Routine (10).