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
The master matrix is a scoring system that can be used to evaluate the siting of permitted confinement feeding operations. Counties that have adopted a construction evaluation resolution can use the master matrix. Counties must re-adopt the construction evaluation resolution annually between January 1 and January 31, starting in 2004, to continue to use the master matrix.
Producers in counties that have adopted the matrix must meet higher standards than other permitted facilities. Before they can be approved for construction, they must earn points on the master matrix for choosing sites and using practices that reduce adverse impacts on the environment and the community. Producers must have 50% (440 points minimum) of the total score and at least 25% of the available points in each of the three subcategories of air, water and community impacts to pass the master matrix.
The following links provide additional information about the Master Matrix:
Who Needs the Master Matrix?
The Master Matrix must be completed by operations applying for a construction permit, unless they can meet one of the following two exemptions:
Note: producers must also submit the supporting master matrix documents (e.g. design, operation and maintenance plans as written in certain matrix items).
Master Matrix document
Master Matrix Technical Advisory Committee
Critical public areas
The following maps show which counties adopted the Construction Evaluation Resolution (CER) to use the Master Matrix:
Map of Counties that adopted the CER in 2018
Map of Counties that adopted the CER in 2017Map of Counties that adopted the CER in 2016Map of Counties that adopted the CER in 2015
Map of Counties that adopted the CER in 2014
High Quality Water Resources
County officials and staff can find more information about adopting a construction evaluation resolution on the Iowa State Association of Counties' website. (off-site) Look under News, and then under Topics of Interest.