PAYMENT OPTIONS Online Bill PayTo pay your bill online, Click Here! Pay by Phone You may pay by phone by calling (505) 747-8459. In Person The NCSWA main office is located at 2016 N. Riverside Drive, Española, New Mexico. There is a payment drop-box for after-hours payments. By Mail Our mailing address is: PO Box 1230 Española, NM 87532.