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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

MS0310010 , Philadelphia Water Assn

26 of the 53 analytes this system has been tested for have been detected at least once, across 432 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 432 samples on record, detections range from September 24, 2003 to July 30, 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 Philadelphia 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 77 of 77 results Jul 24, 2007 Jul 30, 2026
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 62 of 62 results Sep 15, 2004 Jun 25, 2026
TTHM 2950 Organic Chemical 61 of 61 results Sep 15, 2004 Nov 18, 2024
Lead 1030 Inorganic Chemical 51 of 77 results Jul 24, 2007 Jul 29, 2026
Dibromochloromethane 2944 Organic Chemical 47 of 47 results May 17, 2006 Nov 18, 2024
Chloroform 2941 Organic Chemical 46 of 47 results May 17, 2006 Nov 18, 2024
Bromoform 2942 Organic Chemical 46 of 47 results May 17, 2006 Nov 18, 2024
Bromodichloromethane 2943 Organic Chemical 46 of 47 results May 17, 2006 Nov 18, 2024
Dichloroacetic Acid 2451 Organic Chemical 43 of 43 results Sep 24, 2007 Jun 25, 2026
Trichloroacetic Acid 2452 Organic Chemical 43 of 43 results Sep 24, 2007 Jun 25, 2026
Dibromoacetic Acid 2454 Organic Chemical 41 of 43 results Sep 24, 2007 Jun 25, 2026
Barium 1010 Inorganic Chemical 30 of 30 results Sep 24, 2003 Feb 26, 2025
Fluoride 1025 Inorganic Chemical 30 of 30 results Sep 24, 2003 Feb 26, 2025
Chromium 1020 Inorganic Chemical 26 of 30 results Sep 24, 2003 May 16, 2022
Sodium 1052 Inorganic Chemical 9 of 9 results Sep 25, 2019 Feb 5, 2025
Xylenes, Total 2955 Organic Chemical 9 of 89 results Aug 26, 2013 Jul 31, 2017
Arsenic 1005 Inorganic Chemical 9 of 30 results Feb 23, 2004 Jan 14, 2009
Monochloroacetic Acid 2450 Organic Chemical 7 of 43 results Apr 30, 2008 Jul 16, 2013
Nickel 1036 Inorganic Chemical 7 of 30 results Mar 21, 2005 Apr 11, 2012
Sulfate 1055 Inorganic Chemical 6 of 6 results Sep 24, 2003 Feb 23, 2004
Monobromoacetic Acid 2453 Organic Chemical 5 of 43 results Aug 17, 2009 Nov 13, 2017
Selenium 1045 Inorganic Chemical 5 of 30 results Feb 23, 2004 Mar 21, 2005
Cyanide 1024 Inorganic Chemical 3 of 30 results Sep 14, 2009 Apr 2, 2012
Nitrate-Nitrite 1038 Inorganic Chemical 2 of 70 results May 1, 2007 Feb 21, 2023
Nitrate 1040 Inorganic Chemical 2 of 70 results May 1, 2007 Feb 21, 2023
Ethylbenzene 2992 Organic Chemical 1 of 89 results Aug 26, 2013 Aug 26, 2013

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 51–60 of 432 samples, newest first — collected February 21, 2023 to July 18, 2023. The summary above covers all 432.

19 results from the 10 samples listed here: 11 detected, 8 not detected. Across the whole record it is 714 of 3,149. 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 4 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 Philadelphia Water Assn, every result from 51 to 60 of 432 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
Jul 18, 2023 08:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-230719-058
Laboratory
MSDH Lab
0.163 mg/l , sample collected Jul 18, 2023 08:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 18, 2023 08:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Jul 18, 2023 07:00
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-230719-057
Laboratory
MSDH Lab
0.577 mg/l , sample collected Jul 18, 2023 07:00, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.8 ug/l , sample collected Jul 18, 2023 07:00, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
Jul 18, 2023 06:00
Sampling point
LC0011 Location withheld
Sample type
Routine
Lab sample
PB-230719-056
Laboratory
MSDH Lab
0.0893 mg/l , sample collected Jul 18, 2023 06:00, sampling point LC0011 Copper, Free 1022 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
0.8 ug/l , sample collected Jul 18, 2023 06:00, sampling point LC0011 Lead 1030 EPA method 200.8 Jan 1, 2021 – Dec 31, 2023
Collected
May 9, 2023 14:45
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
HA-230510-011
Laboratory
MSDH Lab
9.84 ug/l , sample collected May 9, 2023 14:45, sampling point SMT Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2023 – Dec 31, 2023
Collected
May 9, 2023 14:15
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
HA-230510-010
Laboratory
MSDH Lab
30 ug/l , sample collected May 9, 2023 14:15, sampling point SMH Total Haloacetic Acids (Haa5) 2456 EPA method 552.2 Jan 1, 2023 – Dec 31, 2023
Collected
May 9, 2023 14:30
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
TH-230510-011
Laboratory
MSDH Lab
28.2 ug/l , sample collected May 9, 2023 14:30, sampling point SMT TTHM 2950 EPA method 524.2 Jan 1, 2023 – Dec 31, 2023
Collected
May 9, 2023 14:00
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
TH-230510-010
Laboratory
MSDH Lab
86.1 ug/l , sample collected May 9, 2023 14:00, sampling point SMH TTHM 2950 EPA method 524.2 Jan 1, 2023 – Dec 31, 2023
Collected
Apr 3, 2023 14:30
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
NI-230404-023
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 3, 2023 14:30, 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 Apr 3, 2023 14:30, 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 Apr 3, 2023 14:30, sampling point TF101 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Apr 3, 2023 14:45
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
NI-230404-022
Laboratory
MSDH Lab
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Apr 3, 2023 14:45, 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 Apr 3, 2023 14:45, 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 Apr 3, 2023 14:45, sampling point TF102 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Collected
Feb 21, 2023 13:15
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
NI-230222-110
Laboratory
MSDH Lab
0.105 mg/l , sample collected Feb 21, 2023 13:15, sampling point TF103 Nitrate-Nitrite 1038 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
0.105 mg/l , sample collected Feb 21, 2023 13:15, sampling point TF103 Nitrate 1040 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023
Not detected below 0.02 mg/l Minimum Reporting Level , sample collected Feb 21, 2023 13:15, sampling point TF103 Nitrite 1041 EPA method QC10107041C Jan 1, 2023 – Dec 31, 2023

Routine (10).