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Evans Plunge (Hot Springs, City of)

Amusement And Recreation, Hot Springs, South Dakota. NPDES permit SD0024767 expired Dec 31, 2024; its limits still apply. Last 12 months: no values over a limit, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 28 days after each period: form A monthly (7 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 0 values over a limit, 12 required values missing, 7 of 12 reports late

Limits in force (7)

Parameter	Statistic	Limit	Months
Temperature, water deg. centigrade	30-day average	report only (deg C)	all year
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year
Flow rate	daily maximum	report only (MGD)	all year
pH	daily minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 8.8 SU	all year
Floating solids, waste or visible foam-visual	daily maximum	≤ 0 N=0;Y=1	all year
Chlorine, total residual	daily maximum	≤ .019 mg/L	all year

How strict are these limits?

pH, daily maximum 8.8 SU — stricter than 78% of 46 other minor industrial and other permits in South Dakota; 2% have the same limit
Chlorine, total residual, daily maximum .019 mg/L — stricter than 59% of 3,547 other minor industrial and other permits nationwide; 38% have the same limit
pH, daily minimum at least 6.5 SU — stricter than 28% of 46 other minor industrial and other permits in South Dakota; 57% have the same limit

Cited limits by parameter: South Dakota's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SD0024767 · MCP: https://passage-data.com/mcp