Based on EPA UCMR5 monitoring data, EPA SDWIS federal violations records, and EWG Tap Water Database published findings.
Agricultural runoff is the primary documented contaminant driver for this water source, per EWG and EPA records. Nitrate levels have exceeded or approached health guidelines in recent monitoring cycles. Herbicide residues consistent with corn and soy farming — including atrazine and metolachlor — are also detected in available data.
Water source: Surface water (Mill Creek/Kansas River)
Water utility: Johnson County Water District #1
Detected at approximately 4.9 ppt per EPA monitoring data — above the EPA's 4 ppt maximum contaminant level (effective 2026). Reverse osmosis or AquaTru filtration removes 99%+ of PFAS compounds.
The EPA's new maximum contaminant level (MCL) for PFAS is 4 ppt, effective 2026. PFAS compounds have been linked to cancer, thyroid disease, immune disruption, and developmental issues at chronic exposure levels per peer-reviewed research.
The following contaminants have been detected or are associated with elevated risk in this water system, per available EPA and EWG published data:
These detections are drawn from EPA SDWIS federal violations database and EWG Tap Water Database records. EWG health guidelines are stricter than EPA legal limits and reflect long-term exposure risk.
No health-based EPA violations recorded in the past 5 years at this utility. Note: EPA violations reflect legal compliance thresholds, which are less protective than the EWG health guidelines used in HAVEN's scoring model.
Reverse osmosis filtration is strongly recommended. AquaTru Carafe ($149) or APEC ROES-50 under-sink RO ($250) remove essentially all documented contaminants in this system. Standard pitcher filters are NOT sufficient for this risk level.
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