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Costilla County has fewer than 30 tests on record, so it doesn't meet our indexing gate. It appears as a row in theColorado county table instead.
54% of 26 radon tests here were at or above 4 pCi/L (EPA's action level). Data through 2025. Source: Colorado county radon test results.
Data through 2025 · Colorado county radon test results
Costilla County has fewer than 30 tests on record, so it doesn't meet our indexing gate. It appears as a row in theColorado county table instead.