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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 321–330 of 379 samples, newest first — collected September 21, 2004 to March 15, 2005. The summary above covers all 379.

62 results from the 10 samples listed here: 13 detected, 49 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 321 to 330 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
Mar 15, 2005
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
050316-009HA
Laboratory
MSDH Lab
0.015 mg/l , sample collected Mar 15, 2005, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2005 – Mar 31, 2005
Collected
Mar 15, 2005
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
050316-009TH
Laboratory
MSDH Lab
114 ug/l , sample collected Mar 15, 2005, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Collected
Feb 28, 2005
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
050301-004CN
Laboratory
MSDH Lab
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Feb 28, 2005, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2005 – Dec 31, 2007
Collected
Feb 28, 2005
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
050301-001IN
Laboratory
MSDH Lab
0.002104 mg/l , sample collected Feb 28, 2005, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.009965 mg/l , sample collected Feb 28, 2005, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Feb 28, 2005, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.003948 mg/l , sample collected Feb 28, 2005, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.379346 mg/l , sample collected Feb 28, 2005, sampling point TF101 Fluoride 1025 EPA method 380-75WE Jan 1, 2005 – Dec 31, 2007
0.000488 mg/l , sample collected Feb 28, 2005, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 28, 2005, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
0.007699 mg/l , sample collected Feb 28, 2005, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 28, 2005, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Feb 28, 2005, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
0.000962 mg/l , sample collected Feb 28, 2005, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2005 – Dec 31, 2007
Collected
Feb 17, 2005
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
050218-014VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Benzene 2990 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Toluene 2991 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Feb 17, 2005, sampling point TF101 Styrene 2996 EPA method 524.2 Jan 1, 2005 – Mar 31, 2005
Collected
Dec 28, 2004
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
041229-012HA
Laboratory
MSDH Lab
0.019 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 Dec 28, 2004, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2004 – Dec 31, 2004
Collected
Dec 14, 2004
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
041215-007TH
Laboratory
MSDH Lab
98 ug/l , sample collected Dec 14, 2004, sampling point MRT000 TTHM 2950 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Collected
Oct 12, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
041013-055VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Benzene 2990 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Toluene 2991 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Oct 12, 2004, sampling point TF101 Styrene 2996 EPA method 524.2 Oct 1, 2004 – Dec 31, 2004
Collected
Sep 21, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040922-131PB
Laboratory
MSDH Lab
0.3796 mg/l , sample collected Sep 21, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2003 – Dec 31, 2005
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 21, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2003 – Dec 31, 2005
Collected
Sep 21, 2004
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
040922-121PB
Laboratory
MSDH Lab
0.3101 mg/l , sample collected Sep 21, 2004, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2003 – Dec 31, 2005
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Sep 21, 2004, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2003 – Dec 31, 2005

Routine (10).