The State Engineer shall notify, by registered or certified mail, the owner of the water right, as determined in the records of the Office of the State Engineer, of whether the State Engineer has granted or denied the holder's request for an extension pursuant to this subsection. If the State Engineer grants an extension pursuant to this subsection and, before the expiration of that extension, proof of resumption of beneficial use or another request for an extension is not filed in the Office of the State Engineer, the State Engineer shall send a final notice to the owner of the water right, by registered or certified mail, that the water right will be declared forfeited if the owner of the water right fails to file the required proof of resumption of beneficial use or an application for an extension of time to prevent forfeiture within 30 days after the date of the final notice. If the owner of the water right fails to file the required proof of resumption of beneficial use or an application for an extension of time to prevent forfeiture within 30 days after the date of such final notice, the State Engineer shall declare the water right, or the portion of the right not returned to beneficial use, forfeited.
a single extension must not exceed 3 years, but any number of extensions may be granted to the holder of such a right.
NRS 534.090