Northwest Natural Gas Company, (NYSE:NWN), dba NW Natural, today filed its annual Purchased Gas Adjustment with the Public Utility Commission of Oregon (OPUC). The proposed rate change includes a 1.7 percent residential increase, which means the average homeowner will pay about $1.06 more per month. The average business customer will see an increase of about 4.2 percent or $9.54 per month. Each fall, NW Natural files for rate changes, based primarily on the wholesale cost of natural gas, plus some annual adjustments based on ongoing agreements with the OPUC. The OPUC is expected to rule on the proposed rate change in late October, with the new rates taking effect on November 1. For more information visit the Rates & Regulations section of nwnatural.com.