About our data

• SSTS: MPCA public REST API licensed-businesses (3,713 business records), retrieved 2026-10-12. Kept businesses with a Current license and an inspector, intermediate inspector or advanced inspector designation: 337 kept after 5 duplicate license numbers were dropped. Expired records (2,400 of 3,713 overall) are excluded. The same data is listed on the Minnesota Geospatial Commons. Terms: public government data, with no license stated on the API. Confirm before launch.
• Radon: MDH Radon Service Providers (Measurement, Mitigation, Analysis Laboratory; single-family service type), paged through the public search on 2026-10-12: 343 + 114 + 14 rows. Grouped into 265 businesses by company name + ZIP. Websites appear as printed by MDH and weren't fetched. No expiry dates are shown, so the list is MDH's current roster.
• Saint Paul TISH: approved evaluator table on stpaul.gov, 37 evaluators.
• Other cities: point-of-sale programs in nine cities, each linked to the official city page and checked 2026-10-13. Minneapolis evaluators: the city's own finder.
• County comes from MPCA's county field, or ZIP via GeoNames (CC BY 4.0). Log: data/cleanup-log.csv.