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Oklahoma Onsite Wastewater Association OOWA The Oklahoma Onsite Wastewater Association OOWA Welcome to the Oklahoma Onsite Wastewater Association OOWA where our commitment is focused on safeguarding the environment and ensuring a sustainable future for generations to come. As a notforprofit association we take pride in our role in representing licensed installers pumpers and profilers in the Oklahoma onsite wastewater industry. Our mission is straightforward to educate wastewater professionals in an effort to increase safety resulting in clean water standards for all Oklahomans. We firmly believe in the profound impact of our collective efforts on the environment contributing to the creation of a healthier and safer future for our children.