The 175 additional cases in August are more than twice the number in any previous month (there were 82 in January 2021 and 79 in November 2020). In just one month, these 175 new cases account for 25 percent of all 695 cases recorded in Jefferson County. It is believed that the actual number is higher, but many people who use home testing kits do not report the results to the local health department.
Also note that nearly 100% of new cases in Washington and the U.S. are the Delta variant. Delta results in a higher number of cases requiring hospitalization and is significantly more contagious than all other variants to date.