Summary
Pertzsch Elementary is a PK–5 school in Onalaska, Wisconsin, serving 373 students as part of the Onalaska School District. In 2025–2026, it ranked 331st of 1,039 Wisconsin elementary schools — 68th percentile with 3 stars — placing it about even with its district overall (69th percentile). Recent years have been somewhat up and down: 74th percentile and 4 stars in 2024–2025, 70th percentile in 2023–2024, and a low of 57th percentile in 2022–2023, before a rebound. Earlier years, from 2015–2016 through 2018–2019, were stronger, mostly in the 72nd–79th percentile.
Math and social studies are the clearest bright spots. Fifth-grade math proficiency was 78.0%, well above the district's 69.31% and the state's 51.81%, and fourth-grade social studies reached 80.3%, compared with 74.51% district-wide and 65.51% statewide. Reading (ELA) is above state averages at every grade. Science is the relative weak spot at 59.09% — above the state but below the district and below nearby peers including Eagle Bluff Elementary (74.67%), Sand Lake Elementary (69.12%), and Viking Elementary (62.69%). Within Onalaska, Eagle Bluff Elementary is the stronger peer (84th percentile, 4 stars), while Northern Hills Elementary is much lower (33rd percentile, 2 stars), with fifth-grade math at 47.76% despite a similar poverty rate.
Attendance is a standout strength: chronic absenteeism was 6.8% in 2024–2025, versus 9.2% for the district and 17.3% statewide, and it has generally stayed low. About 45.04% of students qualified for free or reduced-price lunch, higher than Eagle Bluff, Viking, Sand Lake, and Emerson Elementary, yet Pertzsch still outperforms several of those schools in fifth-grade math and social studies. Per-student spending rose to $16,544, about a 22% increase over three years, with a student–teacher ratio of 13.4. The school is also notably effective with low-income and special education students.
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