Radon testing in Colorado public schools & daycares
Colorado regulation 6 CCR 1010-6 §6.8.4(A) requires every public school to test for radon — a rule in force in substance since 1991, confirmed by three independent rule-version documents found in this research. Unlike Iowa, Colorado's rule has no requirement to publish results: records are kept "on file… for disclosure on request" only, with no requirement to send them to a state agency. Separately, Colorado's child-care regulation (6 CCR 1010-7 §7.14.2(H), effective April 14, 2025) now requires licensed child-care facilities to test within 6 months of occupancy — new enough that public examples are still scarce.
Statewide · sourced
No state portal, and some of the largest districts publish nothing at all
A 2019 KOAA (Colorado Springs) investigation found radon results existed somewhere for 9 Colorado Springs-area districts — but its own reporters had to go to individual schools or file a Colorado Open Records Act request to see them; there is no single public portal, exactly matching the regulation's "on file for disclosure on request" language. Checking Denver-metro districts directly turned up the same split: Douglas County School District and Aurora Public Schools both publish real, current, building-level radon data on their own sites, while Jeffco Public Schools, Cherry Creek School District, and Denver Public Schools — serving a larger combined student population — publish none, despite the same mandate applying to all of them equally.
Sourced from a direct check of each district's own site, 2026-09-30. Checked again at a later date, especially for the three districts with nothing public, since a page's absence today doesn't mean one won't exist later.
Resolved vs. unresolved · sourced
Some exceedances were caught and fixed; several, mostly older, weren't
Douglas County High School's 2025 exceedance (6.5 pCi/L) was caught by a 206-kit sweep, fixed with a ventilation inspection and floor-gap sealing, and verifiably retested below the guideline. Aurora's Murphy Creek P-8 (2020) passed its 2021 retest on the 24-hour average, though hourly readings still spiked above 4.0 during that window — worth stating honestly, since passing on average isn't the same as never exceeding it. Aurora's own Pickens Tech, by contrast, retested in November 2025 and still showed one room (Collision Repair Office) at 4.1 pCi/L — a current, unresolved case, not a historical one. Several older cases (Beulah Middle School, 1990; Timberview Middle School's crawl space, 2002; Coronado High School and Canon School, both 2018) have no confirmed retest or mitigation on record at all.
Sourced from each district's own published lab reports and, for the 2018 Colorado Springs-area cases, contemporaneous KKTV/KOAA reporting. We did not independently chase down whether any of the unconfirmed cases were quietly resolved off the record.
Documented elevated readings, by building
16 buildings · 1990–2026 · multiple districts
Every row below is sourced to a specific district report or contemporaneous news investigation — not a statewide survey, just the districts whose records we could actually reach. Sorted highest reading to lowest. Rows marked DAYCARE are Aurora Public Schools' own Child Development Centers, tested under the district's school program but relevant to Colorado's separate licensed-child-care rule.
Timberview Middle School
Crawl space, not an occupied room154.0 pCi/L max
Colorado Springs, Colorado · Academy School District 20 · tested 2002 — occupied room above retested safe (<0.3 pCi/L) · source
Canon School
Preschool building25.0 pCi/L max
Colorado Springs, Colorado · Cheyenne Mountain School District 12 · tested winter 2017-18 — mitigation underway per district statement, Sept. 2018 — completion unconfirmed · source
Beulah Middle School
Girls' locker room18.0 pCi/L max
Beulah, Colorado · Pueblo County School District 70 · tested 1990 — no confirmed retest or mitigation on record · source
Coronado High School
Auto shop12.0 pCi/L max
Colorado Springs, Colorado · Colorado Springs School District 11 · tested 2018 — no confirmed retest or mitigation on record · source
Laredo Child Development Center — DAYCARE
4 rooms ≥4.0, up to 11.611.6 pCi/L max
Aurora, Colorado · Aurora Public Schools · tested Jan. 2020 — retested May 2021: 3.1 pCi/L, passed · source
South High School
3 rooms ≥4.09.6 pCi/L max
Pueblo, Colorado · Pueblo School District 60 · tested Apr. 2019 — not in the district's own summary table — found in the report's appendix; no confirmed follow-up · source
William Smith High School
4 rooms ≥4.09.6 pCi/L max
Aurora, Colorado · Aurora Public Schools · tested Feb. 2024 — OCR-recovered from a scanned report; no confirmed follow-up · source
Transportation Garage
2 rooms ≥4.09.1 pCi/L max
Aurora, Colorado · Aurora Public Schools · tested Jan. 2025 — no confirmed follow-up · source
Administration Building
5 rooms ≥4.08.6 pCi/L max
Pueblo, Colorado · Pueblo School District 60 · tested Apr.–May 2019 — no confirmed retest or mitigation on record · source
Pickens Tech
13 rooms ≥4.08.0 pCi/L max
Aurora, Colorado · Aurora Public Schools · tested Feb. 2025 — retested Nov. 2025 — one room (Collision Repair Office) still 4.1 pCi/L, not yet resolved · source
Highland Park Elementary School
26 rooms ≥4.07.7 pCi/L max
Pueblo, Colorado · Pueblo School District 60 · tested May 2019 — no confirmed retest or mitigation on record · source
Aurora Hills Middle School
1 room ≥4.07.3 pCi/L max
Aurora, Colorado · Aurora Public Schools · tested Nov. 2023 — no confirmed follow-up · source
Montview Elementary (incl. Annex)
35+ rooms ≥4.0 across 3 test rounds6.6 pCi/L max
Aurora, Colorado · Aurora Public Schools · tested 2017, 2020 & 2021 — largest single-building dataset in this archive; no confirmed resolution on record · source
Douglas County High School
2 of 206 kits ≥4.06.5 pCi/L max
Castle Rock, Colorado · Douglas County School District · tested June 2025 — retested Aug. 2025 after ventilation/sealing fix: 2.9 pCi/L, passed · source
Jamaica Child Development Center — DAYCARE
1 room ≥4.0, elevated twice4.6 pCi/L max
Aurora, Colorado · Aurora Public Schools · tested Feb. 2020 — retested May 2021: 2.9 pCi/L, passed — then elevated again at 4.3 pCi/L in a 2026 initial test, too recent for a retest yet · source
Murphy Creek P-8
3 rooms initially ≥4.04.1 pCi/L max
Aurora, Colorado · Aurora Public Schools · tested Jan. 2020 — retested Apr. 2021: passed on the 24-hr average (3.9 / 3.9 / 2.1), though hourly readings spiked as high as 6.9 during that same window · source
Confidence varies by row and is documented in the underlying research, not shown here: the 1990–2018 Colorado Springs-area readings come from news reporting, not a primary lab report, and are stated as approximate where the article itself didn't print an exact number (Canon School and Coronado High School). The Pueblo School District 60 2019 figures for Highland Park, South Park, and the Administration Building are transcribed directly from the district's own report; the South High School, Irving Elementary, and East High School figures came from script-parsing that same report's appendices, since its own summary table omits them. Several Aurora Public Schools figures (William Smith High School, Dartmouth Elementary, Kenton Elementary) were OCR-recovered from scanned reports with no embedded text and haven't been individually spot-checked against the source PDF. The Timberview Middle School reading is a crawl space, not an occupied room — the classroom above it tested safe. None of this should be read as a statewide survey of Colorado school radon levels; it's what a handful of districts' own records show, dated and sourced as such.
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