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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

MS0090005 , City of Houston

20 of the 58 analytes this system has been tested for have been detected at least once, across 540 samples on record.

The other 38 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 540 samples on record, detections range from July 3, 1992 to July 30, 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 City of Houston, 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 277 of 324 results Jul 3, 1992 Jun 27, 2024
Lead 1030 Inorganic Chemical 252 of 324 results Jul 3, 1992 Jun 27, 2024
Barium 1010 Inorganic Chemical 33 of 33 results Jul 16, 2002 Jan 27, 2025
Fluoride 1025 Inorganic Chemical 33 of 33 results Jul 16, 2002 Jan 27, 2025
Chromium 1020 Inorganic Chemical 17 of 33 results Jul 16, 2002 Apr 8, 2020
Selenium 1045 Inorganic Chemical 17 of 33 results Jul 16, 2002 Apr 8, 2020
Arsenic 1005 Inorganic Chemical 16 of 33 results Feb 16, 2005 Jan 27, 2025
TTHM 2950 Organic Chemical 15 of 22 results Jul 12, 2007 Jul 30, 2025
Bromoform 2942 Organic Chemical 9 of 17 results May 13, 2019 Jul 30, 2025
Sodium 1052 Inorganic Chemical 9 of 9 results Sep 24, 2019 Oct 14, 2024
Nickel 1036 Inorganic Chemical 9 of 33 results Jan 12, 2004 Apr 8, 2020
Nitrite 1041 Inorganic Chemical 8 of 66 results Apr 11, 2007 Jan 10, 2022
Dibromochloromethane 2944 Organic Chemical 4 of 17 results May 13, 2019 Jul 30, 2025
Nitrate-Nitrite 1038 Inorganic Chemical 4 of 66 results Apr 11, 2007 May 7, 2008
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 3 of 20 results Jul 12, 2007 Aug 20, 2014
Thallium, Total 1085 Inorganic Chemical 2 of 33 results Apr 8, 2020 Apr 8, 2020
Dibromoacetic Acid 2454 Organic Chemical 1 of 14 results Dec 20, 2023 Dec 20, 2023
Monobromoacetic Acid 2453 Organic Chemical 1 of 14 results Aug 20, 2014 Aug 20, 2014
Nitrate 1040 Inorganic Chemical 1 of 66 results Jun 7, 2006 Jun 7, 2006
Cadmium 1015 Inorganic Chemical 1 of 33 results Feb 16, 2005 Feb 16, 2005

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 81–90 of 540 samples, newest first — collected June 30, 2021 to July 1, 2021. The summary above covers all 540.

20 results from the 10 samples listed here: 18 detected, 2 not detected. Across the whole record it is 712 of 1,935. 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 3 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 Houston, every result from 81 to 90 of 540 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 1, 2021 08:40
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-210706-023
Laboratory
MSDH Lab
0.201 mg/l , sample collected Jul 1, 2021 08:40, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
2 ug/l , sample collected Jul 1, 2021 08:40, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jul 1, 2021 07:45
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-210706-022
Laboratory
MSDH Lab
0.0306 mg/l , sample collected Jul 1, 2021 07:45, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 1, 2021 07:45, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jul 1, 2021 13:11
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-210706-021
Laboratory
MSDH Lab
0.0983 mg/l , sample collected Jul 1, 2021 13:11, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
0.6 ug/l , sample collected Jul 1, 2021 13:11, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jul 1, 2021 06:40
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-210706-020
Laboratory
MSDH Lab
0.174 mg/l , sample collected Jul 1, 2021 06:40, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
4.4 ug/l , sample collected Jul 1, 2021 06:40, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jul 1, 2021 07:38
Sampling point
LC0029 Location withheld
Sample type
Routine
Lab sample
PB-210706-018
Laboratory
MSDH Lab
0.0669 mg/l , sample collected Jul 1, 2021 07:38, sampling point LC0029 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
0.5 ug/l , sample collected Jul 1, 2021 07:38, sampling point LC0029 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jul 1, 2021 11:15
Sampling point
LC0023 Location withheld
Sample type
Routine
Lab sample
PB-210706-017
Laboratory
MSDH Lab
0.0997 mg/l , sample collected Jul 1, 2021 11:15, sampling point LC0023 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
0.8 ug/l , sample collected Jul 1, 2021 11:15, sampling point LC0023 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jul 1, 2021 13:15
Sampling point
TC0008 Outside Faucet
Sample type
Routine
Lab sample
PB-210706-013
Laboratory
MSDH Lab
0.0788 mg/l , sample collected Jul 1, 2021 13:15, sampling point TC0008 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Jul 1, 2021 13:15, sampling point TC0008 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jul 1, 2021 08:00
Sampling point
LC0014 Location withheld
Sample type
Routine
Lab sample
PB-210706-011
Laboratory
MSDH Lab
0.0602 mg/l , sample collected Jul 1, 2021 08:00, sampling point LC0014 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
150 ug/l , sample collected Jul 1, 2021 08:00, sampling point LC0014 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jun 30, 2021 05:18
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-210706-026
Laboratory
MSDH Lab
0.0787 mg/l , sample collected Jun 30, 2021 05:18, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
0.7 ug/l , sample collected Jun 30, 2021 05:18, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
Collected
Jun 30, 2021 21:20
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
PB-210706-024
Laboratory
MSDH Lab
0.179 mg/l , sample collected Jun 30, 2021 21:20, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021
2.3 ug/l , sample collected Jun 30, 2021 21:20, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2019 – Dec 31, 2021

Routine (10).