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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.

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

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 281–290 of 438 samples, newest first — collected July 12, 2010 to February 17, 2011. The summary above covers all 438.

80 results from the 10 samples listed here: 19 detected, 61 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.

Units in this table

P-Dichlorobenzene is recorded on this page in ug/l and mg/l. 1 mg/l = 1,000 ug/l.

Chemical and radiological sample results for Valley Park W/A, every result from 281 to 290 of 438 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 17, 2011
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
110218-005HA
Laboratory
MSDH Lab
0.006 mg/l , sample collected Feb 17, 2011, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.065 mg/l , sample collected Feb 17, 2011, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.094 mg/l , sample collected Feb 17, 2011, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 17, 2011, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 17, 2011, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.16 mg/l , sample collected Feb 17, 2011, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jan 1, 2011 – Mar 31, 2011
Collected
Feb 17, 2011
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
110218-005TH
Laboratory
MSDH Lab
133 ug/l , sample collected Feb 17, 2011, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 17, 2011, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
7.15 ug/l , sample collected Feb 17, 2011, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 17, 2011, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
140 ug/l , sample collected Feb 17, 2011, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Collected
Feb 9, 2011
Sampling point
TF101 Treatment Plant T10
Sample type
Routine
Lab sample
110210-007NI
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 9, 2011, sampling point TF101 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 9, 2011, sampling point TF101 Nitrate 1040 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 9, 2011, sampling point TF101 Nitrite 1041 EPA method 353.2 Jan 1, 2011 – Dec 31, 2011
Collected
Jan 27, 2011
Sampling point
TF101 Treatment Plant T10
Sample type
Routine
Lab sample
110128-018VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Benzene 2990 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Toluene 2991 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 27, 2011, sampling point TF101 Styrene 2996 EPA method 524.2 Jan 1, 2011 – Mar 31, 2011
Collected
Dec 9, 2010
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
101210-001HA
Laboratory
MSDH Lab
0.005 mg/l , sample collected Dec 9, 2010, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.079 mg/l , sample collected Dec 9, 2010, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.096 mg/l , sample collected Dec 9, 2010, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Dec 9, 2010, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Dec 9, 2010, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.18 mg/l , sample collected Dec 9, 2010, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Oct 1, 2010 – Dec 31, 2010
Collected
Dec 9, 2010
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
101210-001TH
Laboratory
MSDH Lab
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2010, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
7.09 ug/l , sample collected Dec 9, 2010, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Dec 9, 2010, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
7.09 ug/l , sample collected Dec 9, 2010, sampling point MRT000 TTHM 2950 EPA method 524.2 Oct 1, 2010 – Dec 31, 2010
Collected
Aug 11, 2010
Sampling point
TF101 Treatment Plant T10
Sample type
Routine
Lab sample
100812-035NI
Laboratory
MSDH Lab
Not detected below 0.25 mg/l Minimum Reporting Level , sample collected Aug 11, 2010, sampling point TF101 Nitrate-Nitrite 1038 EPA method 353.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.2 mg/l Minimum Reporting Level , sample collected Aug 11, 2010, sampling point TF101 Nitrate 1040 EPA method 353.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.05 mg/l Minimum Reporting Level , sample collected Aug 11, 2010, sampling point TF101 Nitrite 1041 EPA method 353.2 Jan 1, 2010 – Dec 31, 2010
Collected
Jul 22, 2010
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
100723-004HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Jul 22, 2010, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Jul 22, 2010, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 22, 2010, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 22, 2010, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 22, 2010, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0 mg/l This result is recorded as a detection, and the figure the agency wrote — "0.00" — is zero to the precision it was written to. Read the zero as "smaller than the written figure resolves", not as "none present". SDWIS holds a separate numeric concentration that Drinking Water Watch does not publish, so this endpoint does not carry it either; no more precise magnitude is available here. , sample collected Jul 22, 2010, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Jul 1, 2010 – Sep 30, 2010
Collected
Jul 22, 2010
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
100723-004TH
Laboratory
MSDH Lab
52.6 ug/l , sample collected Jul 22, 2010, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 22, 2010, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
3.1 ug/l , sample collected Jul 22, 2010, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jul 22, 2010, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
55.7 ug/l , sample collected Jul 22, 2010, sampling point MRT000 TTHM 2950 EPA method 524.2 Jul 1, 2010 – Sep 30, 2010
Collected
Jul 12, 2010
Sampling point
TF101 Treatment Plant T10
Sample type
Routine
Lab sample
100713-005VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
0.588 ug/l , sample collected Jul 12, 2010, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Benzene 2990 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Toluene 2991 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jul 12, 2010, sampling point TF101 Styrene 2996 EPA method 524.2 Jan 1, 2010 – Dec 31, 2010

Routine (10).