Keystone
Is Keystone tap water safe to drink?
Mostly yes — Keystone scores 100/100. This report aggregates EPA drinking water data across 0 local systems in Keystone. We found 0 total violations (0 unresolved).
Real-Time Environment
Live: 03:30 PM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in Keystone.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in Keystone?
Expert Advice
Your water quality is excellent. Standard filtration is optional but can further enhance taste.
Buying a Filter?
Wondering if Keystone tap water needs filtering? We break it down.
Baby Formula Safety
Mixing baby formula with Keystone tap water? Read this first.
Homebuyer's Perspective
If you're house-hunting in Keystone, water quality belongs on your due-diligence checklist alongside schools and crime data. The high safety score (100/100) suggests lower risk for plumbing corrosion and appliance scaling.
Health & Family Safety
Current records show no major contaminant spikes, making Keystone a preferred choice for health-conscious families.
View Health Risk Glossary →Compliance Record for Keystone
Based on EPA SDWIS violation records and contaminant test results for all water systems serving Keystone.
Frequently Asked Questions
Is Keystone tap water safe to drink?
Mostly yes — Keystone scores 100/100.
How many water systems serve Keystone?
Keystone is served by 0 public water systems in our latest EPA-backed dataset.
How can I check water quality for my exact address in Keystone?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for Keystone.
What is the water quality score for Keystone?
The water quality score for Keystone is 100 out of 100, based on EPA contaminant data, violation history, and testing results for all serving water systems.
What are the top contaminants in Keystone?
Current contaminant data for Keystone is being updated. Check back soon or search your specific address for the latest results.
Keystone Water Quality Summary
Keystone, SD receives a water quality score of 100/100 (Grade A) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 1 public water system serving the area.
Keystone's water quality is above the national average, with strong compliance records and low contaminant levels. Residents generally receive clean, safe tap water that meets EPA standards.
Keystone's score of 100 is 9 points above the South Dakota state average of 91, and above the nationwide average of roughly 78/100 across all U.S. states.
Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our South Dakota water quality rankings report →
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Water Systems Serving Keystone (0)
Water system data coming soon for Keystone.
Check Your Specific Address
Water quality can vary by neighborhood in Keystone.
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Compare Keystone water quality: View all states · Contaminant library · How we score water quality