Is Longmont, Colorado tap water safe?
2 water systems report serving Longmont. Your water depends on which one serves your address. Check your bill if unsure.
A
Countryside of Longmont
Serves 775 people · Surface water · Full report →
No health-based violations in the last 5 years; 3 monitoring/reporting violations; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2025).
A
St Vrain MHP LLC
Serves 544 people · Surface water · Full report →
No health-based violations in the last 5 years; No UCMR 5 PFAS results on file; Lead 90th percentile below the action level (2024).