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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 91–100 of 113 samples, newest first — collected February 21, 1994 to June 29, 1995. The summary above covers all 113.

20 results from the 10 samples listed here: 12 detected, 8 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 91 to 100 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
Jun 29, 1995
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
950630-091L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Jun 29, 1995, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Jun 29, 1995, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 21, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940222-120L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Feb 21, 1994, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Feb 21, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 21, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940222-119L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Feb 21, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Feb 21, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 21, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940222-118L
Laboratory
MSDH Lab
0.139 mg/l , sample collected Feb 21, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.002 mg/l , sample collected Feb 21, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 21, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940222-117L
Laboratory
MSDH Lab
0.214 mg/l , sample collected Feb 21, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.002 mg/l , sample collected Feb 21, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 21, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940222-116L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Feb 21, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Feb 21, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 21, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940222-115L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Feb 21, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.003 mg/l , sample collected Feb 21, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 21, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940222-114L
Laboratory
MSDH Lab
0.602 mg/l , sample collected Feb 21, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.003 mg/l , sample collected Feb 21, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 21, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940222-113L
Laboratory
MSDH Lab
Not detected below 0.02 mg/l Method Detection Limit , sample collected Feb 21, 1994, sampling point DS000 Copper, Free 1022 Not recorded
0.001 mg/l , sample collected Feb 21, 1994, sampling point DS000 Lead 1030 Not recorded
Collected
Feb 21, 1994
Sampling point
DS000 Distribution
Sample type
Routine
Lab sample
940222-112L
Laboratory
MSDH Lab
0.195 mg/l , sample collected Feb 21, 1994, sampling point DS000 Copper, Free 1022 Not recorded
Not detected below 0.001 mg/l Method Detection Limit , sample collected Feb 21, 1994, sampling point DS000 Lead 1030 Not recorded

Routine (10).