Many states use citizen monitoring data to identify problems for further attention. Federal regulations require state agencies to “actively solicit” citizen data in their 303(d) listing process.
“[E]xisting and readily available water quality data” includes “waters for which water quality problems have been reported by local, state, or federal agencies; members of the public; or academic institutions”
(40CFR130.7(b)5(iii).
Some states, such as Maine and Massachusetts, rely on volunteers to help collect water quality data by funding training programs and/or central management of the data collected. Most states have a quality assurance protocol that defines how samples must be taken, tested and documented. If you follow a state monitoring protocol, the state agency should accept your data.