The National Park Service is soliciting quotes for Wastewater Treatment Plant Testing Services at the Buffalo National River in Arkansas. This is a 100% small business set-aside for companies meeting the $19 million size standard under NAICS code 541380. The anticipated award date is on or before May 10, 2026, with a contract effective date of May 15, 2026. To be eligible, a company must have an active UEI and SAM registration. Quotes are to be submitted via email.