---
kind: "section"
citation: "40 C.F.R. § 141.552"
title: "40"
number: "141.552"
heading: "My system consists of “alternative filtration” and is required to conduct a demonstration—what is required of my system and how does the State establish my turbidity limits?"
url: "https://uscodex.org/cfr/40/141.552"
---

# §141.552. My system consists of “alternative filtration” and is required to conduct a demonstration—what is required of my system and how does the State establish my turbidity limits?

- (a) If your system consists of alternative filtration(filtration other than slow sand filtration, diatomaceous earth filtration, conventional filtration, or direct filtration) you are required to conduct a demonstration (see tables in [§ 141.551](/cfr/40/141.551.md)). Your system must demonstrate to the State, using pilot plant studies or other means, that your system's filtration, in combination with disinfection treatment, consistently achieves:
  - (1) 99 percent removal of Cryptosporidium oocysts;
  - (2) 99.9 percent removal and/or inactivation of Giardia lamblia cysts; and
  - (3) 99.99 percent removal and/or inactivation of viruses.
- (b) [Reserved]

## Notes

### Source

Source: 67 FR 1839, Jan. 14, 2002, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 300f, 300g-1, 300g-2, 300g-3, 300g-4, 300g-5, 300g-6, 300j-4, 300j-9, and 300j-11.

### Source

Source: 40 FR 59570, Dec. 24, 1975, unless otherwise noted.