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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

MS0160010 , Willow Grove Water Assn

16 of the 57 analytes this system has been tested for have been detected at least once, across 559 samples on record.

The other 41 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 559 samples on record, detections range from December 31, 1993 to January 28, 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 Willow Grove Water Assn, 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 280 of 315 results Dec 31, 1993 Aug 6, 2024
Lead 1030 Inorganic Chemical 192 of 315 results Dec 31, 1993 Aug 6, 2024
Nitrate-Nitrite 1038 Inorganic Chemical 50 of 69 results May 3, 2004 Jan 28, 2026
Nitrate 1040 Inorganic Chemical 50 of 69 results May 3, 2004 Jan 28, 2026
Barium 1010 Inorganic Chemical 34 of 34 results Apr 23, 2002 Feb 5, 2025
Nickel 1036 Inorganic Chemical 27 of 34 results Apr 23, 2002 Feb 5, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 15 of 15 results Mar 8, 2012 Oct 11, 2012
Sodium 1052 Inorganic Chemical 9 of 9 results Sep 25, 2019 Oct 14, 2024
Fluoride 1025 Inorganic Chemical 9 of 34 results Apr 23, 2002 Oct 3, 2018
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 7 of 21 results Jul 9, 2007 Mar 12, 2025
Chromium 1020 Inorganic Chemical 7 of 34 results Apr 23, 2002 Apr 14, 2014
Sulfate 1055 Inorganic Chemical 6 of 7 results Apr 23, 2002 Jan 28, 2004
Selenium 1045 Inorganic Chemical 4 of 34 results Feb 28, 2005 Mar 20, 2006
Xylenes, Total 2955 Organic Chemical 2 of 46 results Jul 17, 2012 Jul 17, 2012
TTHM 2950 Organic Chemical 2 of 19 results Jul 9, 2007 Sep 16, 2008
Chloroform 2941 Organic Chemical 1 of 14 results Jul 9, 2007 Jul 9, 2007

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 11–20 of 22 samples, newest first — collected October 14, 2024 to February 5, 2025. The summary above covers all 22.

86 results from the 10 samples listed here: 13 detected, 73 not detected. Across the whole record it is 695 of 2,458. 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 Willow Grove Water Assn, every result from 11 to 20 of 22 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 5, 2025 11:23
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
IN-250206-022
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:23, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0187 mg/l , sample collected Feb 5, 2025 11:23, sampling point TF102 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 5, 2025 11:23, sampling point TF102 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 5, 2025 11:23, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:23, sampling point TF102 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 5, 2025 11:23, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0011 mg/l , sample collected Feb 5, 2025 11:23, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:23, sampling point TF102 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 5, 2025 11:23, sampling point TF102 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 5, 2025 11:23, sampling point TF102 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 5, 2025 11:23, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 5, 2025 11:17
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
IN-250206-021
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:17, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.019 mg/l , sample collected Feb 5, 2025 11:17, 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 5, 2025 11:17, 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 5, 2025 11:17, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:17, 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 5, 2025 11:17, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0011 mg/l , sample collected Feb 5, 2025 11:17, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:17, 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 5, 2025 11:17, 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 5, 2025 11:17, 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 5, 2025 11:17, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Feb 5, 2025 11:10
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
IN-250206-020
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:10, sampling point TF080 Arsenic 1005 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0187 mg/l , sample collected Feb 5, 2025 11:10, sampling point TF080 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 5, 2025 11:10, sampling point TF080 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 5, 2025 11:10, sampling point TF080 Chromium 1020 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:10, sampling point TF080 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 5, 2025 11:10, sampling point TF080 Mercury 1035 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.0011 mg/l , sample collected Feb 5, 2025 11:10, sampling point TF080 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Feb 5, 2025 11:10, sampling point TF080 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 5, 2025 11:10, sampling point TF080 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 5, 2025 11:10, sampling point TF080 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 5, 2025 11:10, sampling point TF080 Thallium, Total 1085 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jan 29, 2025 11:30
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-250130-031
Laboratory
MSDH Lab
0.727 mg/l , sample collected Jan 29, 2025 11:30, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
0.727 mg/l , sample collected Jan 29, 2025 11:30, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 29, 2025 11:30, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Jan 29, 2025 11:15
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-250130-032
Laboratory
MSDH Lab
0.728 mg/l , sample collected Jan 29, 2025 11:15, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
0.728 mg/l , sample collected Jan 29, 2025 11:15, 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 Jan 29, 2025 11:15, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Jan 29, 2025 11:08
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
NI-250130-033
Laboratory
MSDH Lab
0.726 mg/l , sample collected Jan 29, 2025 11:08, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
0.726 mg/l , sample collected Jan 29, 2025 11:08, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 29, 2025 11:08, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2025 – Dec 31, 2025
Collected
Jan 29, 2025 10:35
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
VO-250130-008
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Dichloromethane 2964 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Benzene 2990 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Toluene 2991 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jan 29, 2025 10:35, sampling point TF102 Styrene 2996 EPA method 524.2 Jan 1, 2023 – Dec 31, 2025
Collected
Oct 30, 2024 09:31
Sampling point
SM2 Location withheld
Sample type
Routine
Lab sample
810-126324-2
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2024 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 09:31, sampling point SM2 TTHM 2950 EPA method 524.2 Oct 1, 2024 – Dec 31, 2024
Collected
Oct 30, 2024 08:45
Sampling point
SM1 Location withheld
Sample type
Routine
Lab sample
810-126324-1
Laboratory
Eurofins Eaton Analytical South Bend in
Not detected below 2 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
Not detected below 2 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Oct 1, 2024 – Dec 31, 2024
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Oct 30, 2024 08:45, sampling point SM1 TTHM 2950 EPA method 524.2 Oct 1, 2024 – Dec 31, 2024
Collected
Oct 14, 2024 08:58
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NA-241015-005
Laboratory
MSDH Lab
4.83 mg/l , sample collected Oct 14, 2024 08:58, sampling point TF102 Sodium 1052 EPA method 200.7 Jan 1, 2022 – Dec 31, 2024

Routine (10).