LYON-SIOUX RWS-BOYDEN

ATTN DAVE HARMSEN 1107 1ST AVE PO BOX 309, ROCK RAPIDS, IA, 51246 · 712-472-3755

Legal business name: LYON-SIOUX RURAL WATER SYSTEM

On the EPA record

Population served: 605
Service connections: 244
System type: Community water system
Primary water source: Ground water
Owner type: Private

Drinking-water violations on record (16)

EPA's SDWIS records each violation as codes, not sentences. Each one below is shown with EPA's own published description of that violation type and contaminant. Health-based violations — a contaminant limit or treatment requirement not met — are marked apart from monitoring and reporting failures.

2026-01-01 — Monitoring and Reporting

category MR · monitoring & reporting

Monitoring, Regular — Nitrate

Recorded as corrected on 2026-03-31.

2001-03-01 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Single Sample — Nitrate

Recorded as corrected on 2001-03-31.

2000-05-01 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Single Sample — Nitrate

Recorded as corrected on 2000-05-31.

1996-02-01 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Single Sample — Nitrate

Recorded as corrected on 1996-02-29.

1995-11-01 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Single Sample — Nitrate

Recorded as corrected on 1995-11-30.

1994-03-01 — Monitoring and Reporting

category MR · monitoring & reporting

Monitoring, Regular — Nitrate

Recorded as corrected on 1994-03-31.

1994-02-01 — Monitoring and Reporting

category MR · monitoring & reporting

Monitoring, Regular — Nitrate

Recorded as corrected on 1994-02-28.

1993-01-01 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Single Sample — Nitrate

Recorded as corrected on 1993-03-31.

1987-01-01 — Other Violation

category Other · monitoring & reporting

Notification, Public — Nitrate

Recorded as corrected on 1987-01-31.

1986-03-01 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Average — Nitrate

Recorded as corrected on 1986-09-30.

1986-01-27 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Average — Nitrate

Recorded as corrected on 1986-02-26.

1985-02-11 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Single Sample — Nitrate

Recorded as corrected on 1985-03-10.

1985-02-01 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Single Sample — Nitrate

Recorded as corrected on 1985-03-31.

1980-08-18 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Average — Nitrate

Recorded as corrected on 1980-10-17.

1979-07-02 — Maximum Contaminant Level Violation

category MCL · health-based

Maximum Contaminant Level Violation, Average — Nitrate

Recorded as corrected on 1979-12-01.

—

monitoring & reporting

Safe Drinking Water Act violation (EPA violation type code ?)

Source: US Environmental Protection Agency (EPA) · EPA public water system ID (PWSID) IA6000744