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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

MS0500008 , City of Philadelphia

25 of the 60 analytes this system has been tested for have been detected at least once, across 255 samples on record.

The other 35 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 255 samples on record, detections range from October 8, 2003 to November 17, 2025. 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 City of Philadelphia, 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 159 of 160 results Jun 15, 2004 Jun 27, 2025
Lead 1030 Inorganic Chemical 29 of 160 results Jun 15, 2004 Jun 24, 2025
TTHM 2950 Organic Chemical 16 of 19 results Jul 19, 2004 Aug 19, 2025
Chloroform 2941 Organic Chemical 11 of 14 results Aug 27, 2007 Aug 19, 2025
Bromodichloromethane 2943 Organic Chemical 11 of 14 results Aug 27, 2007 Aug 19, 2025
Dibromochloromethane 2944 Organic Chemical 11 of 14 results Aug 27, 2007 Aug 19, 2025
Barium 1010 Inorganic Chemical 10 of 10 results Oct 8, 2003 Mar 18, 2025
Fluoride 1025 Inorganic Chemical 9 of 10 results Oct 8, 2003 Oct 3, 2022
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 8 of 19 results Jun 14, 2010 Nov 12, 2024
Dichloroacetic Acid 2451 Organic Chemical 6 of 14 results Jul 11, 2016 Nov 17, 2025
Nickel 1036 Inorganic Chemical 6 of 10 results Mar 8, 2004 Mar 18, 2025
Gross Alpha, Incl. Radon & U 4002 Radionuclide 5 of 5 results Mar 14, 2012 Oct 9, 2012
Bromoform 2942 Organic Chemical 4 of 14 results Jun 10, 2024 Aug 19, 2025
Sodium 1052 Inorganic Chemical 3 of 3 results Sep 13, 2019 Feb 24, 2025
Chromium 1020 Inorganic Chemical 3 of 10 results Apr 4, 2005 May 7, 2019
Selenium 1045 Inorganic Chemical 2 of 10 results Apr 4, 2005 Apr 29, 2013
Gross Alpha, Excl. Radon & U 4000 Radionuclide 2 of 2 results Sep 17, 2009 Mar 5, 2010
Combined Radium (-226 & -228) 4010 Radionuclide 2 of 7 results Sep 17, 2009 Mar 5, 2010
Radium-226 4020 Radionuclide 2 of 7 results Sep 17, 2009 Mar 5, 2010
Radium-228 4030 Radionuclide 2 of 7 results Sep 17, 2009 Mar 5, 2010
Gross Beta Particle Activity 4100 Radionuclide 2 of 2 results Sep 17, 2009 Mar 5, 2010
Gross Alpha Particle Activity 4109 Radionuclide 2 of 2 results Sep 17, 2009 Mar 5, 2010
Nitrate 1040 Inorganic Chemical 2 of 22 results May 24, 2004 Jul 17, 2006
Sulfate 1055 Inorganic Chemical 2 of 2 results Oct 8, 2003 Mar 8, 2004
Arsenic 1005 Inorganic Chemical 1 of 10 results Apr 29, 2013 Apr 29, 2013

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 28 samples, newest first — collected June 24, 2025 to June 24, 2025. The summary above covers all 28.

20 results from the 10 samples listed here: 10 detected, 10 not detected. Across the whole record it is 310 of 863. 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 10 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 City of Philadelphia, every result from 11 to 20 of 28 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
Jun 24, 2025 05:30
Sampling point
LC0039 Location withheld
Sample type
Routine
Lab sample
PB-250701-004
Laboratory
MSDH Lab
0.006 mg/l , sample collected Jun 24, 2025 05:30, sampling point LC0039 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2025 05:30, sampling point LC0039 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 24, 2025 06:20
Sampling point
LC0044 Location withheld
Sample type
Routine
Lab sample
PB-250701-001
Laboratory
MSDH Lab
0.005 mg/l , sample collected Jun 24, 2025 06:20, sampling point LC0044 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2025 06:20, sampling point LC0044 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 24, 2025 06:30
Sampling point
LC0030 Location withheld
Sample type
Routine
Lab sample
PB-250701-012
Laboratory
MSDH Lab
0.0109 mg/l , sample collected Jun 24, 2025 06:30, sampling point LC0030 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
0.5 ug/l , sample collected Jun 24, 2025 06:30, sampling point LC0030 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 24, 2025 05:45
Sampling point
LC0037 Location withheld
Sample type
Routine
Lab sample
PB-250701-011
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jun 24, 2025 05:45, sampling point LC0037 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2025 05:45, sampling point LC0037 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 24, 2025 04:20
Sampling point
LC0003 Location withheld
Sample type
Routine
Lab sample
PB-250701-014
Laboratory
MSDH Lab
0.002 mg/l , sample collected Jun 24, 2025 04:20, sampling point LC0003 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2025 04:20, sampling point LC0003 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 24, 2025 06:15
Sampling point
LC0006 Location withheld
Sample type
Routine
Lab sample
PB-250701-013
Laboratory
MSDH Lab
0.0023 mg/l , sample collected Jun 24, 2025 06:15, sampling point LC0006 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2025 06:15, sampling point LC0006 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 24, 2025 04:30
Sampling point
LC0001 Location withheld
Sample type
Routine
Lab sample
PB-250701-015
Laboratory
MSDH Lab
0.0168 mg/l , sample collected Jun 24, 2025 04:30, sampling point LC0001 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2025 04:30, sampling point LC0001 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 24, 2025 07:23
Sampling point
LC0009 Location withheld
Sample type
Routine
Lab sample
PB-250701-016
Laboratory
MSDH Lab
0.0008 mg/l , sample collected Jun 24, 2025 07:23, sampling point LC0009 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2025 07:23, sampling point LC0009 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 24, 2025 08:30
Sampling point
LC0040 Location withheld
Sample type
Routine
Lab sample
PB-250701-018
Laboratory
MSDH Lab
0.002 mg/l , sample collected Jun 24, 2025 08:30, sampling point LC0040 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2025 08:30, sampling point LC0040 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Collected
Jun 24, 2025 05:18
Sampling point
LC0043 Location withheld
Sample type
Routine
Lab sample
PB-250701-017
Laboratory
MSDH Lab
0.0139 mg/l , sample collected Jun 24, 2025 05:18, sampling point LC0043 Copper, Free 1022 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jun 24, 2025 05:18, sampling point LC0043 Lead 1030 EPA method 200.8 Jan 1, 2023 – Dec 31, 2025

Routine (10).