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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.

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

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 111–120 of 559 samples, newest first — collected June 7, 2017 to May 2, 2018. The summary above covers all 559.

77 results from the 10 samples listed here: 7 detected, 70 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.

Chemical and radiological sample results for Willow Grove Water Assn, every result from 111 to 120 of 559 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
May 2, 2018 01:10
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
180503-017CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 2, 2018 01:10, sampling point TF080 Cyanide 1024 EPA method QC10204001X Jan 1, 2017 – Dec 31, 2019
Collected
May 2, 2018 01:40
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
180503-015CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 2, 2018 01:40, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2017 – Dec 31, 2019
Collected
May 2, 2018 01:20
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
180503-007CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected May 2, 2018 01:20, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2017 – Dec 31, 2019
Collected
Jan 29, 2018 13:00
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
180130-028NI
Laboratory
MSDH Lab
0.48 mg/l , sample collected Jan 29, 2018 13:00, sampling point TF101 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
0.48 mg/l , sample collected Jan 29, 2018 13:00, sampling point TF101 Nitrate 1040 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 29, 2018 13:00, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
Collected
Jan 29, 2018 12:30
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
180130-027NI
Laboratory
MSDH Lab
0.47 mg/l , sample collected Jan 29, 2018 12:30, sampling point TF080 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
0.47 mg/l , sample collected Jan 29, 2018 12:30, sampling point TF080 Nitrate 1040 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 29, 2018 12:30, sampling point TF080 Nitrite 1041 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
Collected
Jan 29, 2018 13:20
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
180130-026NI
Laboratory
MSDH Lab
0.47 mg/l , sample collected Jan 29, 2018 13:20, sampling point TF102 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
0.47 mg/l , sample collected Jan 29, 2018 13:20, sampling point TF102 Nitrate 1040 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Jan 29, 2018 13:20, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2018 – Dec 31, 2018
Collected
Dec 20, 2017 01:45
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
171221-001VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Dichloromethane 2964 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Benzene 2990 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Toluene 2991 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Dec 20, 2017 01:45, sampling point TF102 Styrene 2996 EPA method 524.2 Jan 1, 2017 – Dec 31, 2019
Collected
Jun 29, 2017 12:45
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
170630-002VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Xylenes, Total 2955 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Dichloromethane 2964 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 O-Dichlorobenzene 2968 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 P-Dichlorobenzene 2969 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Vinyl Chloride 2976 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 1,1-Dichloroethylene 2977 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 1,2-Dichloroethane 2980 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 1,1,1-Trichloroethane 2981 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Carbon Tetrachloride 2982 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 1,2-Dichloropropane 2983 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Trichloroethylene 2984 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 1,1,2-Trichloroethane 2985 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Tetrachloroethylene 2987 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Chlorobenzene 2989 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Benzene 2990 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Toluene 2991 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Ethylbenzene 2992 EPA method 524.2 Not recorded
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017 12:45, sampling point DS000 Styrene 2996 EPA method 524.2 Not recorded
Collected
Jun 29, 2017
Sampling point
TF080 Treatment Plant T080
Sample type
Routine
Lab sample
170630-001VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Dichloromethane 2964 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Benzene 2990 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Toluene 2991 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 29, 2017, sampling point TF080 Styrene 2996 EPA method 524.2 Jan 1, 2017 – Dec 31, 2017
Collected
Jun 7, 2017 19:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
170609-015PB
Laboratory
MSDH Lab
0.1418 mg/l , sample collected Jun 7, 2017 19:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2017 – Dec 31, 2017
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 7, 2017 19:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2017 – Dec 31, 2017

Routine (10).