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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

MS0260003 , Castalian W/A

10 of the 51 analytes this system has been tested for have been detected at least once, across 113 samples on record.

The other 41 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 113 samples on record, detections range from August 17, 1993 to September 10, 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 Castalian W/A, 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 66 of 84 results Aug 17, 1993 Sep 10, 2025
Lead 1030 Inorganic Chemical 36 of 84 results Aug 17, 1993 Sep 10, 2025
TTHM 2950 Organic Chemical 6 of 9 results Jun 4, 2007 Oct 17, 2022
Total Haloacetic Acids (Haa5) 2456 Organic Chemical 4 of 9 results Jun 4, 2007 Oct 17, 2022
Chloroform 2941 Organic Chemical 3 of 6 results Jul 1, 2009 Aug 17, 2017
Dichloroacetic Acid 2451 Organic Chemical 2 of 5 results Jul 1, 2009 Jun 28, 2011
Barium 1010 Inorganic Chemical 2 of 2 results Sep 17, 2003 Feb 9, 2004
Sulfate 1055 Inorganic Chemical 2 of 2 results Sep 17, 2003 Feb 9, 2004
Monobromoacetic Acid 2453 Organic Chemical 1 of 5 results Jul 1, 2009 Jul 1, 2009
Fluoride 1025 Inorganic Chemical 1 of 2 results Sep 17, 2003 Sep 17, 2003

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 71–80 of 113 samples, newest first — collected August 21, 2000 to February 9, 2004. The summary above covers all 113.

56 results from the 10 samples listed here: 9 detected, 47 not detected. Across the whole record it is 123 of 350. 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 Castalian W/A, every result from 71 to 80 of 113 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 9, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
040210-066IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 9, 2004, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.021 mg/l , sample collected Feb 9, 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 Feb 9, 2004, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 9, 2004, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.1 mg/l Minimum Reporting Level , sample collected Feb 9, 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 Feb 9, 2004, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Feb 9, 2004, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 9, 2004, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
11.7 mg/l , sample collected Feb 9, 2004, sampling point TF101 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Feb 9, 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 Feb 9, 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 Feb 9, 2004, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Feb 9, 2004
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
040210-024CN
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Feb 9, 2004, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2002 – Dec 31, 2004
Collected
Sep 17, 2003
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
030918-061CN
Laboratory
MSDH Lab
Not detected below 0.01 mg/l Minimum Reporting Level , sample collected Sep 17, 2003, sampling point TF101 Cyanide 1024 EPA method QC10204001X Jan 1, 2002 – Dec 31, 2004
Collected
Sep 17, 2003
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
030918-025IN
Laboratory
MSDH Lab
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 17, 2003, sampling point TF101 Arsenic 1005 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.026 mg/l , sample collected Sep 17, 2003, 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 Sep 17, 2003, sampling point TF101 Cadmium 1015 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 17, 2003, sampling point TF101 Chromium 1020 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
0.113 mg/l , sample collected Sep 17, 2003, 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 Sep 17, 2003, sampling point TF101 Mercury 1035 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Not detected below 0.005 mg/l Minimum Reporting Level , sample collected Sep 17, 2003, sampling point TF101 Nickel 1036 EPA method 200.8 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 17, 2003, sampling point TF101 Selenium 1045 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
15.1 mg/l , sample collected Sep 17, 2003, sampling point TF101 Sulfate 1055 EPA method 300.0 Not recorded
Not detected below 0.001 mg/l Minimum Reporting Level , sample collected Sep 17, 2003, 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 Sep 17, 2003, 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 Sep 17, 2003, sampling point TF101 Thallium, Total 1085 EPA method 200.8 Jan 1, 2002 – Dec 31, 2004
Collected
Apr 25, 2002
Sampling point
TF101 Treatment Plant T101
Sample type
Routine
Lab sample
020426-001VO
Laboratory
MSDH Lab
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 1,2,4-Trichlorobenzene 2378 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Cis-1,2-Dichloroethylene 2380 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Xylenes, Total 2955 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Dichloromethane 2964 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 O-Dichlorobenzene 2968 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 P-Dichlorobenzene 2969 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Vinyl Chloride 2976 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 1,1-Dichloroethylene 2977 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Trans-1,2-Dichloroethylene 2979 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 1,2-Dichloroethane 2980 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 1,1,1-Trichloroethane 2981 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Carbon Tetrachloride 2982 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 1,2-Dichloropropane 2983 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Trichloroethylene 2984 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 1,1,2-Trichloroethane 2985 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Tetrachloroethylene 2987 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Chlorobenzene 2989 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Benzene 2990 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Toluene 2991 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Ethylbenzene 2992 Not recorded
Not detected below 0.0005 mg/l Method Detection Limit , sample collected Apr 25, 2002, sampling point TF101 Styrene 2996 Not recorded
Collected
Apr 2, 2002
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
Not recorded
Laboratory
STL Billerica
Not detected below 0.197 mfl Minimum Reporting Level , sample collected Apr 2, 2002, sampling point DS000 Asbestos 1094 Not recorded
Collected
Aug 21, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000822-020L
Laboratory
MSDH Lab
0.065 mg/l , sample collected Aug 21, 2000, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Aug 21, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 21, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000822-019L
Laboratory
MSDH Lab
0.018 mg/l , sample collected Aug 21, 2000, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Aug 21, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 21, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000822-018L
Laboratory
MSDH Lab
0.066 mg/l , sample collected Aug 21, 2000, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Aug 21, 2000, sampling point DS000 Lead 1030 Not recorded
Collected
Aug 21, 2000
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
000822-017L
Laboratory
MSDH Lab
0.026 mg/l , sample collected Aug 21, 2000, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Aug 21, 2000, sampling point DS000 Lead 1030 Not recorded

Routine (10).