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PUBLIC WATER SYSTEM REPORT

Is CORNERSTONE OF COLUMBIA Water Safe to Drink in 2026?

Connecticut · PWSID CT0309144 · Ground water

Population served
193
Cities served
COLUMBIA
State / jurisdiction
Connecticut (CT)
PWSID
CT0309144
A
TAP WATER GRADE
Good
Model score 85/88 from violations, PFAS profile, and monitoring signals — not a laboratory test of your faucet.
No major violations flagged in the latest federal quarterly snapshot

Water operator? Publish your official 2027 CCR here — residents already find this page. Claim free →

CONTAMINANTS — EPA UCMR5 MONITORING

No UCMR5 PFAS detects on file for this PWS in our bundled national dataset — the system may be smaller than UCMR5 thresholds, had non-detects, or results are not yet linked to this ID. Your retailer Annual Water Quality Report lists other regulated contaminants (chlorine, DBPs, nitrates, etc.).

VIOLATIONS HISTORY (FEDERAL SNAPSHOT)

EPA’s national SDWA quarterly files associate 0 violation-related records with this system in the same reporting quarter as the utility snapshot used on WaterCheckup. This is not a complete historical docket — see ECHO and SDWIS for full compliance context.

Get alerts if this system's EPA data changes:
WHAT TO DO ABOUT IT

Based on CORNERSTONE OF COLUMBIA's monitoring and violation profile, here are vetted filtration options — same picks framework as our city reports.

TOP PICKS FOR CORNERSTONE OF COLUMBIA
⚠ Recommended protection for municipal tap water
#1
Waterdrop G3P800 RO
EDITORS PICK
Waterdrop  ·  ~$849
Tankless 800 GPD, removes 99%+ PFAS & lead, 10-stage filtration. Smart faucet TDS display.
WHY THIS FOR CORNERSTONE OF COLUMBIA · Chosen for CORNERSTONE OF COLUMBIA because groundwater supplies can carry nitrates, arsenic, and localized contamination. RO is the strongest barrier for sensitive households.
#2
Aquasana SmartFlow RO
MOST CERTIFIED
Aquasana  ·  ~$449
WQA Gold Seal + NSF 42/53/58/401. Most certifications of any under-sink RO. Removes 90+ contaminants.
#3
AquaTru Under-Sink RO
EASIEST FILTER CHANGE
AquaTru  ·  ~$375
NSF 42/53/58 certified. Quick-change filters, no tools. Compact tankless design, 4-stage filtration.
Not sure which filter is right for you? Take the 3-question quiz →
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STAY INFORMED
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