Learn to Hunt
Report Your Harvest
Quick and easy access to recreational privileges in Iowa, including hunting, fishing, and specialty licenses:
Purchase Your Licenses Online
Iowa's natural resources plates include the state bird and flower, pheasant, eagle, buck and a Brook trout. Support conservation in Iowa by buying a natural resource plate for your vehicle.
Natural Resource Plates
Experience Iowa's natural beauty and all the fun our state parks offer. Make your online reservation for state park cabins, camping sites, shelters and lodges.
Support conservation in Iowa by buying a natural resource plate for your vehicle.
Natural Resource Plates
Iowa DNR Customer Service
Mon - Fri, 8:00am - 4:30pm CST
Submit Online Inquiry
Information / Records Requests
Contact Information by County
Below is a list of technical guidance documents for Iowa's air operating permit program.
This table identifies typical control efficiencies that would be achieved by different types of control equipment. It is used in reviewing Title V applications by comparing the applicant’s claimed control efficiency with the table’s value. These are conservative control efficiency values that are used in cases where the applicant has not provided further documentation to support a higher control efficiency (e.g. stack test data).
Glycol ethers is one of 187 listed hazardous air pollutants, as defined by EPA. A frequently asked question the DNR receives is what compounds are included in the glycol ethers category. The guidance document listed below discusses this question, lists a few commonly reported glycol ethers, and refers to an EPA document for further information.
The following two tables list the 187 Hazardous Air Pollutants (HAP's) as defined by EPA. Many of the chemicals regulated as HAP's are also Volatile Organic Compounds (VOC's) because they have volatile and photoreactive properties. Some HAP's are also considered particulate matter (PM). To make this clearer, the AQB has added a column that indicates which HAP's are also classified as VOC's or PM.
This document explains how to estimate emissions from stacks that have conducted more than one DNR-approved stack test during the emissions inventory year. Example estimations are provided for illustrative purposes only.
Operation & Maintenance (O&M) plans are sometimes required as part of a source's periodic monitoring. These are example O&M plans for different types of control equipment. It should be noted that these are generic O&M plans, and they may need to be modified to fit a specific source's needs.
This guidance document was developed by the DNR and a committee of representatives from Title V facilities (finalized on 4/14/1997; revised on 6/11/1997 and 6/18/2001). Its purpose is to provide staff and industry with guidance on how to determine what constitutes acceptable periodic monitoring which must be included in each operating permit, as required by 40 CFR Part 70.
The Iowa DNR conducted SPARS Title V 2015 Emissions Inventory Training Webinars on Wednesday, January 21, 2015 and Thursday, January 22, 2015.
Title V Emissions Inventory SPARS Training Webinar - Site Management January 21, 2015
Title V Emissions Inventory SPARS Training Webinar - Completing the EIQ January 22, 2015