Does Keystone, SD tap water have any EPA-reported violations?

As of June 2026, EPA SDWIS records show 4 violation(s) across the community water systems serving Keystone, of which 0 are classified by the EPA as health-based. Most older violations have returned to compliance; see the per-system list.

Where does Keystone, SD tap water come from?

Keystone is served by 1 active community water system(s). Their primary sources, per EPA records, are: groundwater.

SD / Keystone

SD · Tap water records

Keystone tap water, in plain English

Here is what the EPA's own data shows about tap water in Keystone. According to EPA SDWIS data retrieved June 2026, Keystone is served by 1 active community water system, together reported to serve about 349 people.

As of June 2026, EPA records show 4 violations across the community water system(s) serving Keystone, going back to the earliest EPA record. None were health-based; the records are monitoring or reporting violations (a required test or report was late or missed). Each is listed by system below, with its status.

1

Community water system
~349

People served (EPA-reported)
June 2026

EPA records reviewed through

What the EPA has on record, by system

Keystone

349 served · groundwater · PWSID SD4601082

Monitoring Gross Alpha, Excl. Radon and U: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2019. All have since returned to compliance, per EPA records.
Monitoring Combined Radium (-226 and -228): a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2019. All have since returned to compliance, per EPA records.
Monitoring Combined Uranium: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in January 2019. All have since returned to compliance, per EPA records.
Monitoring Lead and Copper Rule: a monitoring or reporting violation (a required test or report was late or missed — not a measured exceedance), recorded once in October 2010. All have since returned to compliance, per EPA records.

What this means

A health-based violation means a contaminant was recorded above the limit the EPA tracks for it. A monitoring or reporting violation means a required test or report was late or missed — not that a contaminant was measured above a limit. “Returned to compliance” means the EPA recorded the issue as resolved.

This page summarizes the EPA's own records and does not assess whether your water is safe to drink. For the most current details, you can verify every record directly with the EPA, and contact your water system with questions.

Source: U.S. EPA Envirofacts SDWIS, retrieved June 2026. Records cover the EPA's full reporting history for these systems. Verify at EPA ECHO.