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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

MS0240154 , Harrison Central High School

22 of the 53 analytes this system has been tested for have been detected at least once, across 250 samples on record.

The other 31 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 250 samples on record, detections range from November 4, 1993 to March 31, 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 Harrison Central 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
Lead 1030 Inorganic Chemical 106 of 166 results Nov 4, 1993 Aug 14, 2023
Copper, Free 1022 Inorganic Chemical 89 of 166 results Nov 4, 1993 Aug 14, 2023
TTHM 2950 Organic Chemical 11 of 11 results May 24, 2004 Mar 31, 2025
Barium 1010 Inorganic Chemical 11 of 11 results Sep 16, 2003 Feb 13, 2025
Fluoride 1025 Inorganic Chemical 11 of 11 results Sep 16, 2003 Feb 13, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 9 of 10 results Jul 26, 2004 Mar 31, 2025
Chromium 1020 Inorganic Chemical 7 of 11 results Feb 2, 2004 Apr 26, 2022
Chloroform 2941 Organic Chemical 6 of 6 results Aug 1, 2007 May 21, 2019
Bromodichloromethane 2943 Organic Chemical 5 of 6 results Aug 1, 2007 May 21, 2019
Dichloroacetic Acid 2451 Organic Chemical 5 of 5 results Sep 11, 2007 Aug 2, 2018
Trichloroacetic Acid 2452 Organic Chemical 3 of 5 results Sep 11, 2007 Sep 15, 2014
Nitrite 1041 Inorganic Chemical 2 of 29 results Jul 27, 2005 Feb 4, 2013
Dibromochloromethane 2944 Organic Chemical 2 of 6 results Jun 10, 2010 Jul 18, 2012
Nickel 1036 Inorganic Chemical 2 of 11 results Nov 12, 2009 May 10, 2010
Cadmium 1015 Inorganic Chemical 2 of 11 results Mar 9, 2005 Feb 6, 2006
Selenium 1045 Inorganic Chemical 2 of 11 results Mar 9, 2005 Feb 6, 2006
Sulfate 1055 Inorganic Chemical 2 of 2 results Sep 16, 2003 Feb 2, 2004
Sodium 1052 Inorganic Chemical 1 of 1 result Feb 24, 2021 Feb 24, 2021
Monochloroacetic Acid 2450 Organic Chemical 1 of 5 results Aug 2, 2018 Aug 2, 2018
Dibromoacetic Acid 2454 Organic Chemical 1 of 5 results Jul 18, 2012 Jul 18, 2012
Arsenic 1005 Inorganic Chemical 1 of 11 results May 10, 2010 May 10, 2010
Cyanide 1024 Inorganic Chemical 1 of 11 results Sep 15, 2003 Sep 15, 2003

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 250 samples, newest first — collected August 14, 2023 to August 14, 2025. The summary above covers all 250.

26 results from the 10 samples listed here: 10 detected, 16 not detected. Across the whole record it is 280 of 816. 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 Harrison Central High School, every result from 1 to 10 of 250 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
Aug 14, 2025 02:33
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
CN-250815-005
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Aug 14, 2025 02:33, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2023 – Dec 31, 2025
Collected
Mar 31, 2025 11:45
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-250401-009
Laboratory
MSDH Lab
2.48 ug/l , sample collected Mar 31, 2025 11:45, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2025 – Dec 31, 2025
Collected
Mar 31, 2025 11:44
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-250401-009
Laboratory
MSDH Lab
2.57 ug/l , sample collected Mar 31, 2025 11:44, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2025 – Dec 31, 2025
Collected
Feb 20, 2025 13:55
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-250221-001
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 20, 2025 13:55, 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 20, 2025 13:55, 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 20, 2025 13:55, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Feb 13, 2025 14:25
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
IN-250214-004
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 13, 2025 14:25, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0022 mg/l , sample collected Feb 13, 2025 14:25, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 13, 2025 14:25, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 13, 2025 14:25, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.202 mg/l , sample collected Feb 13, 2025 14:25, sampling point TF101 Fluoride 1025 EPA method QC 10-109-12-2-A Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 13, 2025 14:25, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 13, 2025 14:25, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 13, 2025 14:25, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 13, 2025 14:25, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 13, 2025 14:25, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 13, 2025 14:25, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Mar 25, 2024 13:00
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
TH-240326-011
Laboratory
MSDH Lab
4.01 ug/l , sample collected Mar 25, 2024 13:00, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2024 – Dec 31, 2024
Collected
Mar 25, 2024 13:00
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
HA-240326-011
Laboratory
MSDH Lab
2.71 ug/l , sample collected Mar 25, 2024 13:00, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2024 – Dec 31, 2024
Collected
Feb 8, 2024 11:00
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-240209-006
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 8, 2024 11:00, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.08 mg/l Minimum Reporting Level , sample collected Feb 8, 2024 11:00, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 8, 2024 11:00, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2024 – Dec 31, 2024
Collected
Aug 14, 2023 08:21
Sampling point
LC0010 Location withheld
Sample type
Routine
Lab sample
PB-230815-059
Laboratory
MSDH Lab
0.0064 mg/l , sample collected Aug 14, 2023 08:21, sampling point LC0010 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
1.1 ug/l , sample collected Aug 14, 2023 08:21, sampling point LC0010 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Aug 14, 2023 08:18
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-230815-058
Laboratory
MSDH Lab
0.017 mg/l , sample collected Aug 14, 2023 08:18, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.5 ug/l , sample collected Aug 14, 2023 08:18, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023

Routine (10).