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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

MS0300011 , Chevron Usa

23 of the 53 analytes this system has been tested for have been detected at least once, across 485 samples on record.

The other 30 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 485 samples on record, detections range from September 22, 2003 to December 9, 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 Chevron Usa, 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 149 of 150 results Jun 29, 2004 Sep 30, 2024
TTHM 2950 Organic Chemical 130 of 130 results Sep 13, 2004 Dec 9, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 126 of 127 results Oct 7, 2005 Dec 9, 2025
Chloroform 2941 Organic Chemical 87 of 87 results Mar 14, 2007 Dec 14, 2020
Bromodichloromethane 2943 Organic Chemical 87 of 87 results Mar 14, 2007 Dec 14, 2020
Dibromochloromethane 2944 Organic Chemical 87 of 87 results Mar 14, 2007 Dec 14, 2020
Dichloroacetic Acid 2451 Organic Chemical 81 of 81 results Mar 19, 2008 Dec 14, 2020
Trichloroacetic Acid 2452 Organic Chemical 81 of 81 results Mar 19, 2008 Dec 14, 2020
Dibromoacetic Acid 2454 Organic Chemical 79 of 81 results Mar 19, 2008 Dec 14, 2020
Lead 1030 Inorganic Chemical 59 of 150 results Jun 29, 2004 Sep 30, 2024
Monochloroacetic Acid 2450 Organic Chemical 41 of 81 results Mar 19, 2008 Dec 14, 2020
Bromoform 2942 Organic Chemical 39 of 87 results May 2, 2007 Aug 19, 2020
Monobromoacetic Acid 2453 Organic Chemical 23 of 81 results Oct 30, 2008 Aug 19, 2020
Barium 1010 Inorganic Chemical 15 of 15 results Sep 22, 2003 Feb 12, 2025
Fluoride 1025 Inorganic Chemical 15 of 15 results Sep 22, 2003 Feb 12, 2025
Arsenic 1005 Inorganic Chemical 10 of 15 results Mar 16, 2005 Feb 12, 2025
Chromium 1020 Inorganic Chemical 10 of 15 results Sep 22, 2003 May 18, 2022
Selenium 1045 Inorganic Chemical 6 of 15 results Nov 15, 2004 Feb 8, 2006
Nickel 1036 Inorganic Chemical 2 of 15 results May 12, 2010 Nov 26, 2012
Sulfate 1055 Inorganic Chemical 2 of 2 results Sep 22, 2003 Sep 22, 2003
Sodium 1052 Inorganic Chemical 1 of 1 result Mar 22, 2021 Mar 22, 2021
Thallium, Total 1085 Inorganic Chemical 1 of 15 results May 12, 2010 May 12, 2010
Carbon Tetrachloride 2982 Organic Chemical 1 of 20 results Jun 19, 2007 Jun 19, 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 301–310 of 485 samples, newest first — collected August 10, 2009 to February 18, 2010. The summary above covers all 485.

55 results from the 10 samples listed here: 43 detected, 12 not detected. Across the whole record it is 1,132 of 1,992. 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 Chevron Usa, every result from 301 to 310 of 485 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
Feb 18, 2010
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
100219-006TH
Laboratory
MSDH Lab
45.8 ug/l , sample collected Feb 18, 2010, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Feb 18, 2010, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
22.9 ug/l , sample collected Feb 18, 2010, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
7.32 ug/l , sample collected Feb 18, 2010, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
76.02 ug/l , sample collected Feb 18, 2010, sampling point MRT000 TTHM 2950 EPA method 524.2 Jan 1, 2010 – Mar 31, 2010
Collected
Nov 18, 2009
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
091119-002TH
Laboratory
MSDH Lab
45.9 ug/l , sample collected Nov 18, 2009, sampling point MRT000 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Nov 18, 2009, sampling point MRT000 Bromoform 2942 EPA method 524.2 Not recorded
21.4 ug/l , sample collected Nov 18, 2009, sampling point MRT000 Bromodichloromethane 2943 EPA method 524.2 Not recorded
8 ug/l , sample collected Nov 18, 2009, sampling point MRT000 Dibromochloromethane 2944 EPA method 524.2 Not recorded
75.3 ug/l , sample collected Nov 18, 2009, sampling point MRT000 TTHM 2950 EPA method 524.2 Oct 1, 2009 – Dec 31, 2009
Collected
Nov 18, 2009
Sampling point
MRT000 Max. Res. Time
Sample type
Routine
Lab sample
091119-002HA
Laboratory
MSDH Lab
0.01 mg/l , sample collected Nov 18, 2009, sampling point MRT000 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.022 mg/l , sample collected Nov 18, 2009, sampling point MRT000 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.04 mg/l , sample collected Nov 18, 2009, sampling point MRT000 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
0.003 mg/l , sample collected Nov 18, 2009, sampling point MRT000 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Nov 18, 2009, sampling point MRT000 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.07 mg/l , sample collected Nov 18, 2009, sampling point MRT000 Total Haloacetic Acids (Haa5) 2456 Oct 1, 2009 – Dec 31, 2009
Collected
Nov 11, 2009
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
091112-011IN
Laboratory
MSDH Lab
0.000601 mg/l , sample collected Nov 11, 2009, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.074747 mg/l , sample collected Nov 11, 2009, sampling point TF101 Barium 1010 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Nov 11, 2009, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
0.004979 mg/l , sample collected Nov 11, 2009, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
1.09 mg/l , sample collected Nov 11, 2009, sampling point TF101 Fluoride 1025 EPA method 380-75WE Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Nov 11, 2009, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Nov 11, 2009, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.0025 mg/l Minimum Reporting Level , sample collected Nov 11, 2009, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Nov 11, 2009, sampling point TF101 Antimony, Total 1074 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Nov 11, 2009, sampling point TF101 Beryllium, Total 1075 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Nov 11, 2009, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2008 – Dec 31, 2010
Collected
Nov 5, 2009
Sampling point
SM2 Shipping Maintenance
Sample type
Routine
Lab sample
091106-006TH
Laboratory
MSDH Lab
53 ug/l , sample collected Nov 5, 2009, sampling point SM2 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Nov 5, 2009, sampling point SM2 Bromoform 2942 EPA method 524.2 Not recorded
34.4 ug/l , sample collected Nov 5, 2009, sampling point SM2 Bromodichloromethane 2943 EPA method 524.2 Not recorded
17.1 ug/l , sample collected Nov 5, 2009, sampling point SM2 Dibromochloromethane 2944 EPA method 524.2 Not recorded
104.5 ug/l , sample collected Nov 5, 2009, sampling point SM2 TTHM 2950 EPA method 524.2 Not recorded
Collected
Nov 5, 2009
Sampling point
SM1 Utilities Control
Sample type
Routine
Lab sample
091106-005TH
Laboratory
MSDH Lab
39.7 ug/l , sample collected Nov 5, 2009, sampling point SM1 Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Nov 5, 2009, sampling point SM1 Bromoform 2942 EPA method 524.2 Not recorded
23.3 ug/l , sample collected Nov 5, 2009, sampling point SM1 Bromodichloromethane 2943 EPA method 524.2 Not recorded
12.4 ug/l , sample collected Nov 5, 2009, sampling point SM1 Dibromochloromethane 2944 EPA method 524.2 Not recorded
75.4 ug/l , sample collected Nov 5, 2009, sampling point SM1 TTHM 2950 EPA method 524.2 Not recorded
Collected
Nov 5, 2009
Sampling point
SM2 Shipping Maintenance
Sample type
Routine
Lab sample
091106-006HA
Laboratory
MSDH Lab
0.005 mg/l , sample collected Nov 5, 2009, sampling point SM2 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.028 mg/l , sample collected Nov 5, 2009, sampling point SM2 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.035 mg/l , sample collected Nov 5, 2009, sampling point SM2 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Nov 5, 2009, sampling point SM2 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
0.004 mg/l , sample collected Nov 5, 2009, sampling point SM2 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.07 mg/l , sample collected Nov 5, 2009, sampling point SM2 Total Haloacetic Acids (Haa5) 2456 Not recorded
Collected
Nov 5, 2009
Sampling point
SM1 Utilities Control
Sample type
Routine
Lab sample
091106-005HA
Laboratory
MSDH Lab
0.002 mg/l , sample collected Nov 5, 2009, sampling point SM1 Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.023 mg/l , sample collected Nov 5, 2009, sampling point SM1 Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.027 mg/l , sample collected Nov 5, 2009, sampling point SM1 Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
0.002 mg/l , sample collected Nov 5, 2009, sampling point SM1 Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
0.003 mg/l , sample collected Nov 5, 2009, sampling point SM1 Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.05 mg/l , sample collected Nov 5, 2009, sampling point SM1 Total Haloacetic Acids (Haa5) 2456 Not recorded
Collected
Sep 14, 2009
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
090915-012CN
Laboratory
MSDH Lab
Not detected below 0.015 mg/l Minimum Reporting Level , sample collected Sep 14, 2009, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2008 – Dec 31, 2010
Collected
Aug 10, 2009
Sampling point
SM2 Shipping Maintenance
Sample type
Routine
Lab sample
090811-014TH
Laboratory
MSDH Lab
59.7 ug/l , sample collected Aug 10, 2009, sampling point SM2 Chloroform 2941 EPA method 524.2 Not recorded
1.03 ug/l , sample collected Aug 10, 2009, sampling point SM2 Bromoform 2942 EPA method 524.2 Not recorded
36.5 ug/l , sample collected Aug 10, 2009, sampling point SM2 Bromodichloromethane 2943 EPA method 524.2 Not recorded
18.9 ug/l , sample collected Aug 10, 2009, sampling point SM2 Dibromochloromethane 2944 EPA method 524.2 Not recorded
116.13 ug/l , sample collected Aug 10, 2009, sampling point SM2 TTHM 2950 EPA method 524.2 Not recorded

Routine (10).