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PUBLIC WATER SYSTEM REPORT

Is JOHNSTON CO RWS& SWMD #4 Water Safe to Drink in 2026?

Oklahoma · PWSID OK2003503 · Ground water

Population served
600
Cities served
—
State / jurisdiction
Oklahoma (OK)
PWSID
OK2003503
F
TAP WATER GRADE
High risk
Model score 30/88 from violations, PFAS profile, and monitoring signals — not a laboratory test of your faucet.
334 violation record(s) in the latest EPA SDWA quarterly snapshot

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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 334 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.

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WHAT TO DO ABOUT IT

Based on JOHNSTON CO RWS& SWMD #4's monitoring and violation profile, here are vetted filtration options — same picks framework as our city reports.

TOP PICKS FOR JOHNSTON CO RWS& SWMD #4
⚠ EPA violations / contaminants in monitoring data
#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 JOHNSTON CO RWS& SWMD #4 · Chosen for JOHNSTON CO RWS& SWMD #4 because the latest federal SDWA snapshot lists substantial violation activity. Certified reverse osmosis provides the broadest residential barrier for households that want margin beyond legal compliance.
#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.
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STAY INFORMED
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We'll notify you when new PFAS data, EPA violations, or contamination alerts affect JOHNSTON CO RWS& SWMD #4 (PWS OK2003503). One email, no spam, unsubscribe any time.

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