Passage Data · Check a report · Use it from your AI

Platte, City of

Sewage treatment plant, Platte, South Dakota. NPDES permit SD0020354, in force until Dec 31, 2028. Last 12 months: over a limit 15 times (last April 2026), 32 required values missing, 5 of 10 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (18 values)
Last report on file
July 2026
Oct 2024 – Sep 2025
8 values over a limit, 32 required values missing, 7 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 15 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, 30-day average33.25 mg/L≤ 30 mg/L11%
October 2025BOD, 5-day, 20 deg. C, 30-day average33.25 mg/L≤ 30 mg/L11%
October 2025Solids, total suspended, 30-day average111 mg/L≤ 30 mg/L270%
October 2025Solids, total suspended, 30-day average111 mg/L≤ 30 mg/L270%
October 2025Solids, total suspended, maximum 7-day average128 mg/L≤ 45 mg/L184%
October 2025Solids, total suspended, maximum 7-day average128 mg/L≤ 45 mg/L184%
April 2026BOD, 5-day, 20 deg. C, 30-day average39.8 mg/L≤ 30 mg/L33%
April 2026BOD, 5-day, 20 deg. C, 30-day average39.8 mg/L≤ 30 mg/L33%
April 2026BOD, 5-day, 20 deg. C, maximum 7-day average46 mg/L≤ 45 mg/L2%
April 2026BOD, 5-day, 20 deg. C, maximum 7-day average46 mg/L≤ 45 mg/L2%
April 2026Solids, total suspended, 30-day average92.8 mg/L≤ 30 mg/L209%
April 2026Solids, total suspended, 30-day average92.8 mg/L≤ 30 mg/L209%
April 2026Solids, total suspended, maximum 7-day average106.67 mg/L≤ 45 mg/L137%
April 2026Solids, total suspended, maximum 7-day average106.67 mg/L≤ 45 mg/L137%
April 2026pH, daily maximum9.12 SU≤ 9 SU—

Limits in force (20)

ParameterStatisticLimitMonths
Temperature, water deg. centigrade30-day averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LMay–Oct
Nitrogen, ammonia total [as N]30-day average≤ 4.3 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 9.7 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 8.1 mg/LJan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
E. coli, colony forming units [CFU]30-day geometric mean≤ 630 #/100mLMay–Sep
E. coli, colony forming units [CFU]daily maximum≤ 1178 #/100mLMay–Sep
Flow, totalmonthly totalreport only (Mgal)all year
Duration of dischargemonthly totalreport only (d)all year

New limits from Dec 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], 30-day average4.2 mg/L (Feb)tighter——
Nitrogen, ammonia total [as N], daily maximum8.1 mg/L (Jan)tighter——

How strict are these limits?

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

Check this month's numbers Email me before each report is due

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SD0020354 · MCP: https://passage-data.com/mcp