City of Oakland — NPDES permit IA0081523: limits, due date and EPA's record

Water Supply, Oakland, Iowa. NPDES permit IA0081523 expired Nov 30, 2019; its limits still apply. Last 12 months: over a limit 2 times (last October 2025). Source: EPA ECHO, Oct 22, 2026.

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

Period ending	Parameter	Reported	Limit	Over by
October 2025	Sulfate, total [as SO4], 30-day average	3500	≤ 3446 mg/L	2%
October 2025	Sulfate, total [as SO4], daily maximum	3500	≤ 3446 mg/L	2%

Limits in force (30)

Parameter	Statistic	Limit	Months	Outfall
pH	daily minimum	≥ 6.5 SU	all year	001
pH	daily maximum	≤ 9 SU	all year	001
Solids, total suspended	30-day average	≤ 30 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 45 mg/L	all year	001
Chloride [as Cl]	30-day average	≤ 389 mg/L	all year	001
Chloride [as Cl]	daily maximum	≤ 629 mg/L	all year	001
Chloride [as Cl]	30-day average	≤ 324 lb/d	all year	001
Chloride [as Cl]	daily maximum	≤ 524 lb/d	all year	001
Iron, total [as Fe]	30-day average	≤ 1 mg/L	all year	001
Iron, total [as Fe]	daily maximum	≤ 1 mg/L	all year	001
Iron, total [as Fe]	30-day average	≤ .834 lb/d	all year	001
Iron, total [as Fe]	daily maximum	≤ .834 lb/d	all year	001
pH	daily minimum	≥ 6.3 SU	all year	002
pH	daily maximum	≤ 9 SU	all year	002
Sulfate, total [as SO4]	30-day average	≤ 3446 mg/L	all year	002
Sulfate, total [as SO4]	daily maximum	≤ 3446 mg/L	all year	002
Sulfate, total [as SO4]	30-day average	≤ 4964 lb/d	all year	002
Sulfate, total [as SO4]	daily maximum	≤ 4964 lb/d	all year	002
Fluoride, total [as F]	30-day average	≤ 18.835 mg/L	all year	002
Fluoride, total [as F]	daily maximum	≤ 18.835 mg/L	all year	002
Fluoride, total [as F]	30-day average	≤ 26.933 lb/d	all year	002
Fluoride, total [as F]	daily maximum	≤ 26.933 lb/d	all year	002
Iron, total [as Fe]	30-day average	≤ 2.332 mg/L	all year	002
Iron, total [as Fe]	daily maximum	≤ 2.332 mg/L	all year	002
Iron, total [as Fe]	30-day average	≤ 3.335 lb/d	all year	002
Iron, total [as Fe]	daily maximum	≤ 3.335 lb/d	all year	002
Chlorine, total residual	30-day average	≤ .474 mg/L	all year	002
Chlorine, total residual	daily maximum	≤ .474 mg/L	all year	002
Chlorine, total residual	30-day average	≤ .914 lb/d	all year	002
Chlorine, total residual	daily maximum	≤ .914 lb/d	all year	002

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/IA0081523 · MCP: https://passage-data.com/mcp