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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 361–370 of 540 samples, newest first — collected July 16, 2002 to January 28, 2004. The summary above covers all 540.

96 results from the 10 samples listed here: 24 detected, 72 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.

Chemical and radiological sample results for City of Houston, every result from 361 to 370 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
Jan 28, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
040129-047VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 1,2,4-Trichlorobenzene 2378 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Cis-1,2-Dichloroethylene 2380 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Xylenes, Total 2955 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Dichloromethane 2964 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 O-Dichlorobenzene 2968 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 P-Dichlorobenzene 2969 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Vinyl Chloride 2976 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 1,1-Dichloroethylene 2977 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Trans-1,2-Dichloroethylene 2979 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 1,2-Dichloroethane 2980 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 1,1,1-Trichloroethane 2981 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Carbon Tetrachloride 2982 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 1,2-Dichloropropane 2983 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Trichloroethylene 2984 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 1,1,2-Trichloroethane 2985 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Tetrachloroethylene 2987 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Chlorobenzene 2989 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Benzene 2990 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Toluene 2991 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Ethylbenzene 2992 Jan 1, 2004 – Mar 31, 2004
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Jan 28, 2004, sampling point TF101 Styrene 2996 Jan 1, 2004 – Mar 31, 2004
Collected
Jan 12, 2004
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
040113-128CN
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF102 Cyanide 1024 EPA method QC10204001X Jan 1, 2002 – Dec 31, 2004
Collected
Jan 12, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
040113-127CN
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2002 – Dec 31, 2004
Collected
Jan 12, 2004
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
040113-126CN
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF103 Cyanide 1024 EPA method QC10204001X Jan 1, 2002 – Dec 31, 2004
Collected
Jan 12, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
040113-040IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.034 mg/l , sample collected Jan 12, 2004, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.001 mg/l , sample collected Jan 12, 2004, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.818 mg/l , sample collected Jan 12, 2004, sampling point TF101 Fluoride 1025 EPA method 300.0 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.001 mg/l , sample collected Jan 12, 2004, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
0.001 mg/l , sample collected Jan 12, 2004, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 2.5 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF101 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jan 12, 2004
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
040113-039IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF103 Arsenic 1005 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.035 mg/l , sample collected Jan 12, 2004, sampling point TF103 Barium 1010 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF103 Cadmium 1015 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.001 mg/l , sample collected Jan 12, 2004, sampling point TF103 Chromium 1020 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.814 mg/l , sample collected Jan 12, 2004, sampling point TF103 Fluoride 1025 EPA method 300.0 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF103 Mercury 1035 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
0.001 mg/l , sample collected Jan 12, 2004, sampling point TF103 Selenium 1045 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 2.5 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF103 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jan 12, 2004
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
040113-038IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF102 Arsenic 1005 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.046 mg/l , sample collected Jan 12, 2004, sampling point TF102 Barium 1010 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF102 Cadmium 1015 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.002 mg/l , sample collected Jan 12, 2004, sampling point TF102 Chromium 1020 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
1.92 mg/l , sample collected Jan 12, 2004, sampling point TF102 Fluoride 1025 EPA method 300.0 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF102 Mercury 1035 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
0.001 mg/l , sample collected Jan 12, 2004, sampling point TF102 Selenium 1045 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 2.5 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF102 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF102 Antimony, Total 1074 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF102 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jan 12, 2004, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Jul 16, 2002
Sampling point
TF103 Treatment Plant T103
Sample type
Routine
Lab sample
020717-015IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF103 Arsenic 1005 EPA method 200.8 Not recorded
0.037 mg/l , sample collected Jul 16, 2002, sampling point TF103 Barium 1010 EPA method 200.8 Not recorded
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF103 Cadmium 1015 EPA method 200.8 Not recorded
0.003 mg/l , sample collected Jul 16, 2002, sampling point TF103 Chromium 1020 EPA method 200.8 Not recorded
0.207 mg/l , sample collected Jul 16, 2002, sampling point TF103 Fluoride 1025 EPA method 300.0 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF103 Mercury 1035 EPA method 200.8 Not recorded
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF103 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF103 Selenium 1045 EPA method 200.8 Not recorded
Not detected below 2.5 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF103 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF103 Antimony, Total 1074 EPA method 200.8 Not recorded
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF103 Beryllium, Total 1075 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF103 Thallium, Total 1085 EPA method 200.8 Not recorded
Collected
Jul 16, 2002
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
020717-014IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF102 Arsenic 1005 EPA method 200.8 Not recorded
0.034 mg/l , sample collected Jul 16, 2002, sampling point TF102 Barium 1010 EPA method 200.8 Not recorded
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF102 Cadmium 1015 EPA method 200.8 Not recorded
0.003 mg/l , sample collected Jul 16, 2002, sampling point TF102 Chromium 1020 EPA method 200.8 Not recorded
0.19 mg/l , sample collected Jul 16, 2002, sampling point TF102 Fluoride 1025 EPA method 300.0 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF102 Mercury 1035 EPA method 200.8 Not recorded
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF102 Nickel 1036 EPA method 200.8 Not recorded
0.001 mg/l , sample collected Jul 16, 2002, sampling point TF102 Selenium 1045 EPA method 200.8 Not recorded
Not detected below 2.5 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF102 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF102 Antimony, Total 1074 EPA method 200.8 Not recorded
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF102 Beryllium, Total 1075 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF102 Thallium, Total 1085 EPA method 200.8 Not recorded
Collected
Jul 16, 2002
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
020717-007IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF101 Arsenic 1005 EPA method 200.8 Not recorded
0.035 mg/l , sample collected Jul 16, 2002, sampling point TF101 Barium 1010 EPA method 200.8 Not recorded
Not detected below 0.0001 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF101 Cadmium 1015 EPA method 200.8 Not recorded
0.001 mg/l , sample collected Jul 16, 2002, sampling point TF101 Chromium 1020 EPA method 200.8 Not recorded
0.209 mg/l , sample collected Jul 16, 2002, sampling point TF101 Fluoride 1025 EPA method 300.0 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF101 Mercury 1035 EPA method 200.8 Not recorded
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
0.002 mg/l , sample collected Jul 16, 2002, sampling point TF101 Selenium 1045 EPA method 200.8 Not recorded
Not detected below 2.5 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF101 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Not recorded
Not detected below 0.0003 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Not recorded
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Jul 16, 2002, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Not recorded

Routine (10).