No open health-based violations on EPA record in the last 10 years; latest legal-limit breach in the period starting July 2021.
Serves about 1,680 people (823 connections) with surface water from its own intake.
From EPA's record for KS2009908. PurityMap is independent of City of Oswego.
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2 health-based violations in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From July 2021 | Chlorite | 1.02 mg/L | 1.0 mg/L | Resolved |
| From March 2018 | Chlorite | 3.1 mg/L | 1.0 mg/L | Resolved |
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
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Follow this water →City of Oswego's phone number on EPA record is 620-795-4433. Its mailing address is 703 5TH ST, PO BOX 210, OSWEGO, KS 67356.
According to EPA's record, City of Oswego uses surface water from its own intake.
EPA's record shows 2 health-based violations for City of Oswego in the 10 years to July 9, 2026. No open health-based violations on EPA record in the last 10 years. The latest legal-limit breach on record was in the period starting July 2021. EPA also lists 11 missed or late tests or reports in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in City of Oswego's latest lead and copper round, which ended in December 2024, was 3.2 µg/L, below the federal action level of 15 µg/L.
PurityMap has no verified website for City of Oswego. Its phone number on EPA record is 620-795-4433. Its mailing address on EPA record is 703 5TH ST, PO BOX 210, OSWEGO, KS 67356. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.