---
kind: "section"
citation: "40 C.F.R. § 63.9920"
title: "40"
number: "63.9920"
heading: "What are my continuous monitoring requirements?"
url: "https://uscodex.org/cfr/40/63.9920"
---

# §63.9920. What are my continuous monitoring requirements?


For each wet scrubber subject to the operating limits for pressure drop and scrubber water flow rates in [§ 63.9890(b)](/cfr/40/63.9890.md?p=b), you must at all times monitor the hourly average pressure drop and liquid flow rate using a CPMS according to the requirements in [§ 63.9921(a)](/cfr/40/63.9921.md?p=a).


## Notes

### Source

Source: 68 FR 58620, Oct. 10, 2003, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7401 et seq.

### Source

Source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.