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 71–80 of 438 samples, newest first — collected November 8, 2022 to April 24, 2023. The summary above covers all 438.

34 results from the 10 samples listed here: 7 detected, 27 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 2 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 71 to 80 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 Apr 24, 2023 13:30 Sampling point SM2 Location withheld Sample type Routine Lab sample TH-230425-008 Laboratory MSDH Lab
129 ug/l , sample collected Apr 24, 2023 13:30, sampling point SM2	TTHM 2950 EPA method 524.2	Apr 1, 2023 – Jun 30, 2023
Collected Apr 24, 2023 13:00 Sampling point SM1 Location withheld Sample type Routine Lab sample TH-230425-007 Laboratory MSDH Lab
133 ug/l , sample collected Apr 24, 2023 13:00, sampling point SM1	TTHM 2950 EPA method 524.2	Apr 1, 2023 – Jun 30, 2023
Collected Feb 23, 2023 13:40 Sampling point TF102 Treatment Facility TF102 Sample type Routine Lab sample NI-230224-002 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 23, 2023 13:40, sampling point TF102	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 23, 2023 13:40, sampling point TF102	Nitrate 1040 EPA method QC10107041C	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 23, 2023 13:40, sampling point TF102	Nitrite 1041 EPA method QC10107041C	Jan 1, 2023 – Dec 31, 2023
Collected Feb 23, 2023 13:40 Sampling point TF101 Treatment Plant T10 Sample type Routine Lab sample NI-230224-003 Laboratory MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 23, 2023 13:40, sampling point TF101	Nitrate-Nitrite 1038 EPA method QC10107041C	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 23, 2023 13:40, sampling point TF101	Nitrate 1040 EPA method QC10107041C	Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 23, 2023 13:40, sampling point TF101	Nitrite 1041 EPA method QC10107041C	Jan 1, 2023 – Dec 31, 2023
Collected Feb 23, 2023 13:20 Sampling point SM2 Location withheld Sample type Routine Lab sample TH-230224-006 Laboratory MSDH Lab
125 ug/l , sample collected Feb 23, 2023 13:20, sampling point SM2	TTHM 2950 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Collected Feb 23, 2023 12:50 Sampling point SM1 Location withheld Sample type Routine Lab sample TH-230224-005 Laboratory MSDH Lab
125 ug/l , sample collected Feb 23, 2023 12:50, sampling point SM1	TTHM 2950 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Collected Feb 23, 2023 13:20 Sampling point SM2 Location withheld Sample type Routine Lab sample HA-230224-006 Laboratory MSDH Lab
6.99 ug/l , sample collected Feb 23, 2023 13:20, sampling point SM2	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Jan 1, 2023 – Mar 31, 2023
Collected Feb 23, 2023 12:50 Sampling point SM1 Location withheld Sample type Routine Lab sample HA-230224-005 Laboratory MSDH Lab
9.08 ug/l , sample collected Feb 23, 2023 12:50, sampling point SM1	Total Haloacetic Acids (Haa5) 2456 EPA method 552.2	Jan 1, 2023 – Mar 31, 2023
Collected Jan 26, 2023 13:10 Sampling point TF102 Treatment Facility TF102 Sample type Routine Lab sample VO-230127-002 Laboratory MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	1,2,4-Trichlorobenzene 2378 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Cis-1,2-Dichloroethylene 2380 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Xylenes, Total 2955 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Dichloromethane 2964 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	O-Dichlorobenzene 2968 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	P-Dichlorobenzene 2969 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Vinyl Chloride 2976 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	1,1-Dichloroethylene 2977 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Trans-1,2-Dichloroethylene 2979 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	1,2-Dichloroethane 2980 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	1,1,1-Trichloroethane 2981 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Carbon Tetrachloride 2982 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	1,2-Dichloropropane 2983 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Trichloroethylene 2984 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	1,1,2-Trichloroethane 2985 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Tetrachloroethylene 2987 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Chlorobenzene 2989 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Benzene 2990 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Toluene 2991 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Ethylbenzene 2992 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 26, 2023 13:10, sampling point TF102	Styrene 2996 EPA method 524.2	Jan 1, 2023 – Mar 31, 2023
Collected Nov 8, 2022 14:10 Sampling point SM2 Location withheld Sample type Routine Lab sample TH-221109-044 Laboratory MSDH Lab
117 ug/l , sample collected Nov 8, 2022 14:10, sampling point SM2	TTHM 2950 EPA method 524.2	Oct 1, 2022 – Dec 31, 2022

Collected
Apr 24, 2023 13:30

Sampling point
SM2 Location withheld

Sample type
Routine

Lab sample
TH-230425-008

Laboratory
MSDH Lab

Monitoring period
Apr 1, 2023 – Jun 30, 2023
- TTHM 2950 EPA method 524.2
  
  Result
  129 ug/l
Collected
Apr 24, 2023 13:00

Sampling point
SM1 Location withheld

Sample type
Routine

Lab sample
TH-230425-007

Laboratory
MSDH Lab

Monitoring period
Apr 1, 2023 – Jun 30, 2023
- TTHM 2950 EPA method 524.2
  
  Result
  133 ug/l
Collected
Feb 23, 2023 13:40

Sampling point
TF102 Treatment Facility TF102

Sample type
Routine

Lab sample
NI-230224-002

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Dec 31, 2023
- Nitrate-Nitrite 1038 EPA method QC10107041C
  
  Result
  Not detected below 0.1 mg/l Minimum Reporting Level
- Nitrate 1040 EPA method QC10107041C
  
  Result
  Not detected below 0.08 mg/l Minimum Reporting Level
- Nitrite 1041 EPA method QC10107041C
  
  Result
  Not detected below 0.02 mg/l Minimum Reporting Level
Collected
Feb 23, 2023 13:40

Sampling point
TF101 Treatment Plant T10

Sample type
Routine

Lab sample
NI-230224-003

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Dec 31, 2023
- Nitrate-Nitrite 1038 EPA method QC10107041C
  
  Result
  Not detected below 0.1 mg/l Minimum Reporting Level
- Nitrate 1040 EPA method QC10107041C
  
  Result
  Not detected below 0.08 mg/l Minimum Reporting Level
- Nitrite 1041 EPA method QC10107041C
  
  Result
  Not detected below 0.02 mg/l Minimum Reporting Level
Collected
Feb 23, 2023 13:20

Sampling point
SM2 Location withheld

Sample type
Routine

Lab sample
TH-230224-006

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Mar 31, 2023
- TTHM 2950 EPA method 524.2
  
  Result
  125 ug/l
Collected
Feb 23, 2023 12:50

Sampling point
SM1 Location withheld

Sample type
Routine

Lab sample
TH-230224-005

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Mar 31, 2023
- TTHM 2950 EPA method 524.2
  
  Result
  125 ug/l
Collected
Feb 23, 2023 13:20

Sampling point
SM2 Location withheld

Sample type
Routine

Lab sample
HA-230224-006

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Mar 31, 2023
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  6.99 ug/l
Collected
Feb 23, 2023 12:50

Sampling point
SM1 Location withheld

Sample type
Routine

Lab sample
HA-230224-005

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Mar 31, 2023
- Total Haloacetic Acids (Haa5) 2456 EPA method 552.2
  
  Result
  9.08 ug/l
Collected
Jan 26, 2023 13:10

Sampling point
TF102 Treatment Facility TF102

Sample type
Routine

Lab sample
VO-230127-002

Laboratory
MSDH Lab

Monitoring period
Jan 1, 2023 – Mar 31, 2023
- 1,2,4-Trichlorobenzene 2378 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Cis-1,2-Dichloroethylene 2380 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Xylenes, Total 2955 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Dichloromethane 2964 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- O-Dichlorobenzene 2968 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- P-Dichlorobenzene 2969 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Vinyl Chloride 2976 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1-Dichloroethylene 2977 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Trans-1,2-Dichloroethylene 2979 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,2-Dichloroethane 2980 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1,1-Trichloroethane 2981 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Carbon Tetrachloride 2982 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,2-Dichloropropane 2983 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Trichloroethylene 2984 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- 1,1,2-Trichloroethane 2985 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Tetrachloroethylene 2987 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Chlorobenzene 2989 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Benzene 2990 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Toluene 2991 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Ethylbenzene 2992 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
- Styrene 2996 EPA method 524.2
  
  Result
  Not detected below 0.5 ug/l Minimum Reporting Level
Collected
Nov 8, 2022 14:10

Sampling point
SM2 Location withheld

Sample type
Routine

Lab sample
TH-221109-044

Laboratory
MSDH Lab

Monitoring period
Oct 1, 2022 – Dec 31, 2022
- TTHM 2950 EPA method 524.2
  
  Result
  117 ug/l

Routine (10).