EPA requires that samples must be taken from:
| Contaminant Type | Water Source Type | Time Frame | Frequency |
|---|---|---|---|
| List 1 Contaminants ‐ Cyanotoxins-Microcystins | SW or GWUDI | March – November | You must monitor twice a month for four consecutive months (total of eight sampling events). Sample events must occur two weeks |
| List 1 Contaminants – Additional 20 Chemicals | SW or GWUDI | March – November | You must monitor four times during your 12‐ month monitoring period. Sample events must occur two months apart. (Example: If your first sampling event is in March, the second monitoring must occur during May, the third during July, and the fourth during September). |
| GW | March – November | You must monitor two times during your 12‐ month monitoring period. Sample events must occur six months apart. (Example: If your first monitoring is in March, the second monitoring must occur during September. If your first monitoring is in November, the second monitoring must occur in May). |
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