Special field sampling requirements for PWSs

Pace provides a webinar for PWSs seeking to understand the special field sampling requirements of UCMR 4. For further information contact:

drinkingwater@pacelabs.com

800-966-5668

Sampling Requirements include:

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) at the EPTDS points. Sample events must occur every two weeks.
List 1 Contaminants – Additional 20 Chemicals SW or GWUDI March – November You must monitor four times during your 12 month monitoring period at the EPTDS and D/DBPR points. Sample events must occur on a quarterly basis. Samples from a SR intake must also be taken for Total Organic Carbon and Bromide.
GW March – November You must monitor two times during your 12‐ month monitoring period at the EPTDS and D/DBPR points. 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). Samples from a SR intake must also be taken for Total Organic Carbon and Bromide.
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