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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

MS0240263 , West Harrison High School

32 of the 65 analytes this system has been tested for have been detected at least once, across 203 samples on record.

The other 33 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 203 samples on record, detections range from September 8, 2009 to April 23, 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 West Harrison High School, 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
Copper, Free 1022 Inorganic Chemical 104 of 104 results Oct 29, 2009 Aug 14, 2024
Lead 1030 Inorganic Chemical 42 of 104 results Oct 29, 2009 Jul 21, 2021
Xylenes, Total 2955 Organic Chemical 23 of 48 results Oct 28, 2009 May 13, 2021
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 9 of 9 results Sep 8, 2009 Apr 23, 2025
TTHM 2950 Organic Chemical 9 of 9 results Sep 8, 2009 Apr 23, 2025
Fluoride 1025 Inorganic Chemical 8 of 8 results Apr 19, 2011 Feb 15, 2024
Barium 1010 Inorganic Chemical 7 of 7 results Apr 19, 2011 Feb 15, 2024
Ethylbenzene 2992 Organic Chemical 7 of 48 results Oct 28, 2009 Jul 24, 2017
Dichloroacetic Acid 2451 Organic Chemical 5 of 5 results Sep 8, 2009 Jul 24, 2017
Chloroform 2941 Organic Chemical 5 of 5 results Sep 8, 2009 Jul 24, 2017
Bromodichloromethane 2943 Organic Chemical 5 of 5 results Sep 8, 2009 Jul 24, 2017
Dibromochloromethane 2944 Organic Chemical 5 of 5 results Sep 8, 2009 Jul 24, 2017
Trichloroacetic Acid 2452 Organic Chemical 4 of 5 results Sep 8, 2009 Jul 24, 2017
Chromium 1020 Inorganic Chemical 3 of 7 results Apr 19, 2011 Mar 25, 2020
Sodium 1052 Inorganic Chemical 2 of 2 results Aug 26, 2015 Feb 24, 2021
Monochloroacetic Acid 2450 Organic Chemical 1 of 5 results Jul 24, 2017 Jul 24, 2017
Calcium 1016 Inorganic Chemical 1 of 1 result Aug 26, 2015 Aug 26, 2015
Chloride 1017 Inorganic Chemical 1 of 1 result Aug 26, 2015 Aug 26, 2015
Magnesium 1031 Inorganic Chemical 1 of 1 result Aug 26, 2015 Aug 26, 2015
Manganese 1032 Inorganic Chemical 1 of 1 result Aug 26, 2015 Aug 26, 2015
Potassium 1042 Inorganic Chemical 1 of 1 result Aug 26, 2015 Aug 26, 2015
Sulfate 1055 Inorganic Chemical 1 of 1 result Aug 26, 2015 Aug 26, 2015
Residue, Total, Filterable 1057 Water Quality 1 of 1 result Aug 26, 2015 Aug 26, 2015
Alkalinity, Caco3 Stability 1067 Water Quality 1 of 1 result Aug 26, 2015 Aug 26, 2015
Color 1905 Water Quality 1 of 1 result Aug 26, 2015 Aug 26, 2015
Hardness, Total (As Caco3) 1915 Water Quality 1 of 1 result Aug 26, 2015 Aug 26, 2015
Alkalinity, Total 1927 Water Quality 1 of 1 result Aug 26, 2015 Aug 26, 2015
Calculated Sodium NACA Water Quality 1 of 1 result Aug 26, 2015 Aug 26, 2015
PH, Field Result PHFD Water Quality 1 of 1 result Aug 26, 2015 Aug 26, 2015
Nickel 1036 Inorganic Chemical 1 of 7 results Dec 1, 2014 Dec 1, 2014
Monobromoacetic Acid 2453 Organic Chemical 1 of 5 results Aug 10, 2010 Aug 10, 2010
Bromoform 2942 Organic Chemical 1 of 5 results Sep 8, 2009 Sep 8, 2009

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 1–10 of 203 samples, newest first — collected August 14, 2024 to April 23, 2025. The summary above covers all 203.

38 results from the 10 samples listed here: 8 detected, 30 not detected. Across the whole record it is 255 of 1,431. 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 6 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 West Harrison High School, every result from 1 to 10 of 203 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 23, 2025 12:32
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-250424-019
Laboratory
MSDH Lab
24.8 ug/l , sample collected Apr 23, 2025 12:32, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2025 – Dec 31, 2025
Collected
Apr 23, 2025 12:28
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-250424-019
Laboratory
MSDH Lab
13.5 ug/l , sample collected Apr 23, 2025 12:28, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Collected
Feb 12, 2025 15:00
Sampling point
TF101
Sample type
Routine
Lab sample
VO-250213-005
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Dichloromethane 2964 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Benzene 2990 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Toluene 2991 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, sampling point TF101 Styrene 2996 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Collected
Feb 12, 2025 15:00
Sampling point
TF101
Sample type
Routine
Lab sample
NI-250213-021
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 12, 2025 15:00, 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 12, 2025 15:00, 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 12, 2025 15:00, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Aug 14, 2024 14:00
Sampling point
LC0001 Location withheld
Sample type
Routine
Lab sample
PB-240815-040
Laboratory
MSDH Lab
0.0253 mg/l , sample collected Aug 14, 2024 14:00, sampling point LC0001 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2024 14:00, sampling point LC0001 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Aug 14, 2024 14:02
Sampling point
LC0002 Location withheld
Sample type
Routine
Lab sample
PB-240815-039
Laboratory
MSDH Lab
0.0558 mg/l , sample collected Aug 14, 2024 14:02, sampling point LC0002 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2024 14:02, sampling point LC0002 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Aug 14, 2024 14:04
Sampling point
LC0003 Location withheld
Sample type
Routine
Lab sample
PB-240815-038
Laboratory
MSDH Lab
0.0383 mg/l , sample collected Aug 14, 2024 14:04, sampling point LC0003 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2024 14:04, sampling point LC0003 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Aug 14, 2024 14:06
Sampling point
LC0004 Location withheld
Sample type
Routine
Lab sample
PB-240815-037
Laboratory
MSDH Lab
0.0181 mg/l , sample collected Aug 14, 2024 14:06, sampling point LC0004 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2024 14:06, sampling point LC0004 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Aug 14, 2024 14:15
Sampling point
LC0005 Location withheld
Sample type
Routine
Lab sample
PB-240815-036
Laboratory
MSDH Lab
0.0495 mg/l , sample collected Aug 14, 2024 14:15, sampling point LC0005 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2024 14:15, sampling point LC0005 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Collected
Aug 14, 2024 14:18
Sampling point
LC0006 Location withheld
Sample type
Routine
Lab sample
PB-240815-035
Laboratory
MSDH Lab
0.0313 mg/l , sample collected Aug 14, 2024 14:18, sampling point LC0006 Copper, Free 1022 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2024 14:18, sampling point LC0006 Lead 1030 EPA method 200.8 Jan 1, 2022 – Dec 31, 2024

Routine (10).