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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

MS0610016 , Monterey Water Assn-West

39 of the 73 analytes this system has been tested for have been detected at least once, across 419 samples on record.

The other 34 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 419 samples on record, detections range from October 22, 2003 to June 29, 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 Monterey Water Assn-West, 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 61 of 61 results Aug 14, 2007 Jul 20, 2023
Lead 1030 Inorganic Chemical 46 of 61 results Aug 14, 2007 Jul 20, 2023
Fluoride 1025 Inorganic Chemical 39 of 39 results Oct 22, 2003 Mar 24, 2025
TTHM 2950 Organic Chemical 36 of 36 results Sep 13, 2004 Jun 29, 2026
Barium 1010 Inorganic Chemical 36 of 36 results Oct 22, 2003 Mar 24, 2025
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 35 of 35 results Sep 13, 2004 Nov 24, 2025
Chloroform 2941 Organic Chemical 31 of 31 results Oct 11, 2006 Jun 29, 2026
Bromodichloromethane 2943 Organic Chemical 31 of 31 results Oct 11, 2006 Jun 29, 2026
Dichloroacetic Acid 2451 Organic Chemical 28 of 28 results Jul 2, 2008 Nov 24, 2025
Trichloroacetic Acid 2452 Organic Chemical 28 of 28 results Jul 2, 2008 Nov 24, 2025
Xylenes, Total 2955 Organic Chemical 25 of 89 results Jun 4, 2009 Sep 21, 2022
Gross Alpha, Incl. Radon & U 4002 Radionuclide 20 of 20 results Mar 15, 2012 Oct 16, 2012
Dibromochloromethane 2944 Organic Chemical 18 of 31 results Oct 11, 2006 Jun 29, 2026
Chromium 1020 Inorganic Chemical 14 of 36 results Mar 24, 2004 Mar 31, 2014
Sodium 1052 Inorganic Chemical 11 of 11 results Feb 19, 2009 Dec 14, 2023
Ethylbenzene 2992 Organic Chemical 10 of 89 results Sep 2, 2010 Sep 21, 2022
Sulfate 1055 Inorganic Chemical 6 of 6 results Oct 22, 2003 Feb 19, 2009
Nickel 1036 Inorganic Chemical 5 of 36 results Mar 27, 2006 Mar 31, 2014
Selenium 1045 Inorganic Chemical 5 of 36 results Mar 24, 2004 May 15, 2013
Dibromoacetic Acid 2454 Organic Chemical 3 of 28 results Jun 9, 2009 Nov 24, 2025
Monochloroacetic Acid 2450 Organic Chemical 3 of 28 results Dec 7, 2009 Aug 26, 2024
Arsenic 1005 Inorganic Chemical 3 of 36 results Mar 24, 2004 Oct 19, 2022
Calcium 1016 Inorganic Chemical 3 of 3 results Feb 19, 2009 Feb 19, 2009
Potassium 1042 Inorganic Chemical 3 of 3 results Feb 19, 2009 Feb 19, 2009
Residue, Total, Filterable 1057 Water Quality 3 of 3 results Feb 19, 2009 Feb 19, 2009
Alkalinity, Caco3 Stability 1067 Water Quality 3 of 3 results Feb 19, 2009 Feb 19, 2009
Carbon Dioxide 1901 Water Quality 3 of 3 results Feb 19, 2009 Feb 19, 2009
Color 1905 Water Quality 3 of 3 results Feb 19, 2009 Feb 19, 2009
Hardness, Total (As Caco3) 1915 Water Quality 3 of 3 results Feb 19, 2009 Feb 19, 2009
Alkalinity, Total 1927 Water Quality 3 of 3 results Feb 19, 2009 Feb 19, 2009
Iron, Field Result FEFD Inorganic Chemical 3 of 3 results Feb 19, 2009 Feb 19, 2009
Calculated Sodium NACA Water Quality 3 of 3 results Feb 19, 2009 Feb 19, 2009
PH, Field Result PHFD Water Quality 3 of 3 results Feb 19, 2009 Feb 19, 2009
Monobromoacetic Acid 2453 Organic Chemical 2 of 28 results Jul 2, 2008 Sep 2, 2009
Chloride 1017 Inorganic Chemical 2 of 3 results Feb 19, 2009 Feb 19, 2009
Manganese 1032 Inorganic Chemical 2 of 3 results Feb 19, 2009 Feb 19, 2009
PH 1925 Water Quality 2 of 2 results Feb 19, 2009 Feb 19, 2009
Bromoform 2942 Organic Chemical 1 of 31 results Jun 29, 2026 Jun 29, 2026
Mercury 1035 Inorganic Chemical 1 of 35 results Dec 19, 2016 Dec 19, 2016

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 201–210 of 419 samples, newest first — collected May 27, 2014 to August 26, 2014. The summary above covers all 419.

65 results from the 10 samples listed here: 21 detected, 44 not detected. Across the whole record it is 537 of 3,177. 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 2 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 Monterey Water Assn-West, every result from 201 to 210 of 419 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
Aug 26, 2014 05:40
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140827-216PB
Laboratory
MSDH Lab
0.0247 mg/l , sample collected Aug 26, 2014 05:40, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
0.0047 mg/l , sample collected Aug 26, 2014 05:40, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Collected
Aug 26, 2014 08:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140827-215PB
Laboratory
MSDH Lab
0.0645 mg/l , sample collected Aug 26, 2014 08:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Not detected below 0.0005 mg/l Minimum Reporting Level , sample collected Aug 26, 2014 08:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Collected
Aug 26, 2014 07:30
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140827-214PB
Laboratory
MSDH Lab
0.0648 mg/l , sample collected Aug 26, 2014 07:30, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
0.0006 mg/l , sample collected Aug 26, 2014 07:30, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Collected
Aug 26, 2014 10:05
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140827-213PB
Laboratory
MSDH Lab
0.0251 mg/l , sample collected Aug 26, 2014 10:05, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
0.004 mg/l , sample collected Aug 26, 2014 10:05, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Collected
Aug 26, 2014 19:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140827-209PB
Laboratory
MSDH Lab
0.2896 mg/l , sample collected Aug 26, 2014 19:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
0.0012 mg/l , sample collected Aug 26, 2014 19:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Collected
Aug 26, 2014 08:00
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
140827-207PB
Laboratory
MSDH Lab
0.1937 mg/l , sample collected Aug 26, 2014 08:00, sampling point DS000 Copper, Free 1022 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
0.0007 mg/l , sample collected Aug 26, 2014 08:00, sampling point DS000 Lead 1030 EPA method 200.8 Jan 1, 2012 – Dec 31, 2014
Collected
Aug 14, 2014 11:30
Sampling point
TF105
Sample type
Routine
Lab sample
140815-002VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Xylenes, Total 2955 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Dichloromethane 2964 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 O-Dichlorobenzene 2968 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 P-Dichlorobenzene 2969 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Vinyl Chloride 2976 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 1,1-Dichloroethylene 2977 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 1,2-Dichloroethane 2980 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 1,1,1-Trichloroethane 2981 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Carbon Tetrachloride 2982 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 1,2-Dichloropropane 2983 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Trichloroethylene 2984 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 1,1,2-Trichloroethane 2985 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Tetrachloroethylene 2987 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Chlorobenzene 2989 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Benzene 2990 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Toluene 2991 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Ethylbenzene 2992 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected Aug 14, 2014 11:30, sampling point TF105 Styrene 2996 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Collected
Jun 25, 2014 08:50
Sampling point
SMT Location withheld
Sample type
Routine
Lab sample
140626-015TH
Laboratory
MSDH Lab
32.1 ug/l , sample collected Jun 25, 2014 08:50, sampling point SMT Chloroform 2941 EPA method 524.2 Not recorded
Not detected below 1 ug/l Minimum Reporting Level , sample collected Jun 25, 2014 08:50, sampling point SMT Bromoform 2942 EPA method 524.2 Not recorded
10.7 ug/l , sample collected Jun 25, 2014 08:50, sampling point SMT Bromodichloromethane 2943 EPA method 524.2 Not recorded
7.28 ug/l , sample collected Jun 25, 2014 08:50, sampling point SMT Dibromochloromethane 2944 EPA method 524.2 Not recorded
50.1 ug/l , sample collected Jun 25, 2014 08:50, sampling point SMT TTHM 2950 EPA method 524.2 Jan 1, 2014 – Dec 31, 2014
Collected
Jun 25, 2014 09:25
Sampling point
SMH Location withheld
Sample type
Routine
Lab sample
140626-006HA
Laboratory
MSDH Lab
Not detected below 0.002 mg/l Minimum Reporting Level , sample collected Jun 25, 2014 09:25, sampling point SMH Monochloroacetic Acid 2450 EPA method 552.2 Not recorded
0.029 mg/l , sample collected Jun 25, 2014 09:25, sampling point SMH Dichloroacetic Acid 2451 EPA method 552.2 Not recorded
0.017 mg/l , sample collected Jun 25, 2014 09:25, sampling point SMH Trichloroacetic Acid 2452 EPA method 552.2 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Jun 25, 2014 09:25, sampling point SMH Monobromoacetic Acid 2453 EPA method 552.2 Not recorded
0.001 mg/l , sample collected Jun 25, 2014 09:25, sampling point SMH Dibromoacetic Acid 2454 EPA method 552.2 Not recorded
0.047 mg/l , sample collected Jun 25, 2014 09:25, sampling point SMH Total Haloacetic Acids (Haa5) 2456 Jan 1, 2014 – Dec 31, 2014
Collected
May 27, 2014 12:30
Sampling point
TF102 Treatment Plant T102
Sample type
Routine
Lab sample
140528-008VO
Laboratory
MSDH Lab
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 1,2,4-Trichlorobenzene 2378 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Cis-1,2-Dichloroethylene 2380 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
5.7 ug/l , sample collected May 27, 2014 12:30, sampling point TF102 Xylenes, Total 2955 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Dichloromethane 2964 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 O-Dichlorobenzene 2968 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 P-Dichlorobenzene 2969 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Vinyl Chloride 2976 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 1,1-Dichloroethylene 2977 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Trans-1,2-Dichloroethylene 2979 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 1,2-Dichloroethane 2980 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 1,1,1-Trichloroethane 2981 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Carbon Tetrachloride 2982 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 1,2-Dichloropropane 2983 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Trichloroethylene 2984 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 1,1,2-Trichloroethane 2985 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Tetrachloroethylene 2987 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Chlorobenzene 2989 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Benzene 2990 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Toluene 2991 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
1.23 ug/l , sample collected May 27, 2014 12:30, sampling point TF102 Ethylbenzene 2992 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014
Not detected below 0.5 ug/l Minimum Reporting Level , sample collected May 27, 2014 12:30, sampling point TF102 Styrene 2996 EPA method 524.2 Apr 1, 2014 – Jun 30, 2014

Routine (10).