Surface Water Treatment Rules (SWTR)Advanced 26 min read

Surface Water Treatment Rules: Advanced Compliance II — Watershed Control, Disinfection Profiling & Reporting

Avoided-filtration and watershed control program criteria for unfiltered systems, the CFR-grounded mechanics of disinfection profiling and benchmarking, and the recordkeeping/reporting obligations that run across the full SWTR rule family — advanced compliance-scenario training for Class A operators.

A system that decides to switch disinfectants to cut down on regulated disinfection byproducts might, without meaning to, quietly weaken its protection against Giardia and viruses at the exact same time — solving one regulatory problem by creating another. EPA built a specific safeguard into the SWTR family for exactly this risk: disinfection profiling and benchmarking. Alongside it sit two other pieces of genuinely advanced compliance work that fall to Class A operators — the watershed control program and avoided-filtration criteria that let a small number of unfiltered systems legally skip filtration, and the recordkeeping and reporting backbone that ties the entire SWTR family together on paper. This guide covers all three.

Watershed Control Programs and Avoided Filtration

The default expectation under the SWTR family is that any system using a surface water or GWUDI source filte

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