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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

MS0280018 , Valley Park W/A

31 of the 58 analytes this system has been tested for have been detected at least once, across 438 samples on record.

The other 27 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 438 samples on record, detections range from March 29, 2004 to March 3, 2026. These figures cover the whole record; the list of samples further down is narrowed.

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 Valley Park W/A, 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 102 of 113 results Jun 7, 2004 Mar 3, 2026
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 99 of 108 results Dec 14, 2004 Mar 3, 2026
Copper, Free 1022 Inorganic Chemical 95 of 95 results Jun 26, 2007 Sep 23, 2025
Lead 1030 Inorganic Chemical 87 of 95 results Jun 26, 2007 Sep 23, 2025
Chloroform 2941 Organic Chemical 65 of 74 results May 15, 2006 Mar 3, 2026
Bromodichloromethane 2943 Organic Chemical 61 of 75 results May 15, 2006 Mar 3, 2026
Dichloroacetic Acid 2451 Organic Chemical 60 of 68 results Sep 24, 2007 Mar 3, 2026
Trichloroacetic Acid 2452 Organic Chemical 55 of 68 results Sep 24, 2007 Mar 3, 2026
Monochloroacetic Acid 2450 Organic Chemical 22 of 68 results Jan 30, 2008 Nov 14, 2017
Barium 1010 Inorganic Chemical 17 of 17 results Nov 15, 2004 Apr 8, 2025
Fluoride 1025 Inorganic Chemical 17 of 17 results Nov 15, 2004 Apr 8, 2025
Chromium 1020 Inorganic Chemical 12 of 17 results Mar 16, 2005 Apr 8, 2025
Dibromochloromethane 2944 Organic Chemical 7 of 75 results May 13, 2010 Mar 5, 2020
Xylenes, Total 2955 Organic Chemical 6 of 42 results Mar 29, 2004 Aug 28, 2006
Arsenic 1005 Inorganic Chemical 5 of 17 results Oct 27, 2021 Apr 8, 2025
Sodium 1052 Inorganic Chemical 4 of 4 results Sep 30, 2019 Oct 21, 2024
Combined Radium (-226 & -228) 4010 Radionuclide 3 of 6 results Sep 28, 2011 Mar 28, 2018
Nickel 1036 Inorganic Chemical 2 of 17 results Apr 16, 2008 Feb 23, 2022
Radium-228 4030 Radionuclide 2 of 6 results Sep 28, 2011 Mar 28, 2018
Selenium 1045 Inorganic Chemical 2 of 17 results Mar 16, 2005 Feb 6, 2006
Ethylbenzene 2992 Organic Chemical 2 of 42 results Mar 29, 2004 May 31, 2005
Cyanide 1024 Inorganic Chemical 1 of 17 results May 6, 2025 May 6, 2025
Carbon Tetrachloride 2982 Organic Chemical 1 of 42 results Mar 4, 2025 Mar 4, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 1 of 2 results Dec 17, 2019 Dec 17, 2019
Monobromoacetic Acid 2453 Organic Chemical 1 of 68 results Jul 18, 2013 Jul 18, 2013
Gross Alpha Particle Activity 4109 Radionuclide 1 of 4 results Sep 18, 2012 Sep 18, 2012
Radium-226 4020 Radionuclide 1 of 6 results Jun 14, 2012 Jun 14, 2012
P-Dichlorobenzene 2969 Organic Chemical 1 of 42 results Jul 12, 2010 Jul 12, 2010
Nitrate-Nitrite 1038 Inorganic Chemical 1 of 31 results May 27, 2008 May 27, 2008
Nitrate 1040 Inorganic Chemical 1 of 31 results May 27, 2008 May 27, 2008
Styrene 2996 Organic Chemical 1 of 42 results Oct 26, 2004 Oct 26, 2004

Showing samples collected between September 25, 2024 and September 25, 2026. That is this page’s default, not a limit on what the agency records.

Show every sample on record

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The most recent samples, result by result

The table below lists 1–10 of 46 samples, newest first — collected September 22, 2025 to July 14, 2026. The summary above covers all 46.

55 results from the 10 samples listed here: 20 detected, 35 not detected. Across the whole record it is 735 of 2,265. 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 4 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 Valley Park W/A, every result from 1 to 10 of 46 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
Jul 14, 2026
Sampling point
TF102 Treatment Facility TF102
Sample type
Routine
Lab sample
35051917001
Laboratory
Pace Analytical Services, LLC
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Cyanide 1024 EPA method 335.4 Jan 1, 2026 – Dec 31, 2031
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Dichloromethane 2964 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Benzene 2990 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Toluene 2991 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 14, 2026, sampling point TF102 Styrene 2996 EPA method 524.2 Jan 1, 2026 – Dec 31, 2026
Collected
Mar 3, 2026 10:00
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
810-182679-2
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Mar 3, 2026 10:00, sampling point SM2 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
12 ug/l , sample collected Mar 3, 2026 10:00, sampling point SM2 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
19 ug/l , sample collected Mar 3, 2026 10:00, sampling point SM2 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Mar 3, 2026 10:00, sampling point SM2 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Mar 3, 2026 10:00, sampling point SM2 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
31 ug/l , sample collected Mar 3, 2026 10:00, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
27 ug/l , sample collected Mar 3, 2026 10:00, sampling point SM2 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 3, 2026 10:00, sampling point SM2 Bromoform 2942 EPA method 524.2 Not recorded
1.6 ug/l , sample collected Mar 3, 2026 10:00, sampling point SM2 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 3, 2026 10:00, sampling point SM2 Dibromochloromethane 2944 EPA method 524.2 Not recorded
28.6 ug/l , sample collected Mar 3, 2026 10:00, sampling point SM2 TTHM 2950 EPA method 524.2 Not recorded
Collected
Mar 3, 2026 09:30
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-182679-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Mar 3, 2026 09:30, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
16 ug/l , sample collected Mar 3, 2026 09:30, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
26 ug/l , sample collected Mar 3, 2026 09:30, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Mar 3, 2026 09:30, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Mar 3, 2026 09:30, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
42 ug/l , sample collected Mar 3, 2026 09:30, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Not recorded
37 ug/l , sample collected Mar 3, 2026 09:30, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 3, 2026 09:30, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
2.2 ug/l , sample collected Mar 3, 2026 09:30, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Mar 3, 2026 09:30, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
39.2 ug/l , sample collected Mar 3, 2026 09:30, sampling point SM1 TTHM 2950 EPA method 524.2 Not recorded
Collected
Feb 17, 2026 10:00
Sampling point
TF101 Treatment Plant T10
Sample type
Routine
Lab sample
NI-260218-001
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 17, 2026 10:00, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 17, 2026 10:00, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 17, 2026 10:00, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Oct 28, 2025 09:30
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
TH-251029-002
Laboratory
MSDH Lab
41 ug/l , sample collected Oct 28, 2025 09:30, sampling point SM2 TTHM 2950 EPA method 524.2 Oct 1, 2025 – Dec 31, 2025
Collected
Oct 28, 2025 10:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
TH-251029-001
Laboratory
MSDH Lab
57.3 ug/l , sample collected Oct 28, 2025 10:00, sampling point SM1 TTHM 2950 EPA method 524.2 Oct 1, 2025 – Dec 31, 2025
Collected
Oct 28, 2025 09:30
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
HA-251029-002
Laboratory
MSDH Lab
31.2 ug/l , sample collected Oct 28, 2025 09:30, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2025 – Dec 31, 2025
Collected
Oct 28, 2025 10:00
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
HA-251029-001
Laboratory
MSDH Lab
38.2 ug/l , sample collected Oct 28, 2025 10:00, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2025 – Dec 31, 2025
Collected
Sep 23, 2025 04:30
Sampling point
LC0010 Location withheld
Sample type
Routine
Lab sample
PB-250924-038
Laboratory
MSDH Lab
1.35 mg/l , sample collected Sep 23, 2025 04:30, sampling point LC0010 Copper, Free 1022 EPA method 200.8 Jan 1, 2025 – Dec 31, 2027
1.2 ug/l , sample collected Sep 23, 2025 04:30, sampling point LC0010 Lead 1030 EPA method 200.8 Jan 1, 2025 – Dec 31, 2027
Collected
Sep 22, 2025 12:15
Sampling point
LC0011 Location withheld
Sample type
Routine
Lab sample
PB-250924-040
Laboratory
MSDH Lab
0.161 mg/l , sample collected Sep 22, 2025 12:15, sampling point LC0011 Copper, Free 1022 EPA method 200.8 Jan 1, 2025 – Dec 31, 2027
2.4 ug/l , sample collected Sep 22, 2025 12:15, sampling point LC0011 Lead 1030 EPA method 200.8 Jan 1, 2025 – Dec 31, 2027

Routine (10).