---
kind: "section"
citation: "40 C.F.R. § 60.4335a"
title: "40"
number: "60.4335a"
heading: "How do I demonstrate compliance with my NO X emissions standard without using a NO X CEMS if I use water or steam injection?"
url: "https://uscodex.org/cfr/40/60.4335a"
---

# §60.4335a. How do I demonstrate compliance with my NO X emissions standard without using a NO X CEMS if I use water or steam injection?


If you qualify and elect to demonstrate continuous compliance according to the provisions of [§ 60.4333a(c)(1)](/cfr/40/60.4333a.md?p=c-1), you must install, calibrate, maintain, and operate a continuous monitoring system to monitor and record the fuel consumption and the water or steam to fuel ratio fired in the combustion turbine engine consistent with the requirements in [§ 60.4342a](/cfr/40/60.4342a.md). Water or steam only needs to be injected when a fuel is being combusted that requires water or steam injection for compliance with the applicable NOX emissions standard.


## Notes

### Source

Source: 91 FR 1985, Jan. 15, 2026, unless otherwise noted.

### Authority

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

### Source

Source: 36 FR 24877, Dec. 23, 1971, unless otherwise noted.