Missouri Mining Investments, LLC

Lead And Zinc Ores, major discharger, Fredericktown, Missouri. NPDES permit MO0098752, in force until Jun 30, 2029. Last 12 months: over a limit 93 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due

About 28 days after each period: outfall 001 form M monthly (24 values), outfall 001 form Q quarterly (4 values), outfall 002 form M monthly (26 values), outfall 002 form Q quarterly (6 values), outfall 006 form OM monthly (2 values), outfall 008 form Q quarterly (14 values), and 3 more forms

Last report on file

August 2026

Oct 2024 – Sep 2025

92 values over a limit, 0 required values missing, 0 of 77 reports late

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

All 93 values over a limit

Period ending	Outfall	Parameter	Reported	Limit	Over by
October 2025	001	Chlorides + Sulfates, daily maximum	1055.74	≤ 1000 mg/L	6%
October 2025	001	Chlorides + Sulfates, monthly average	1055.74	≤ 1000 mg/L	6%
October 2025	002	Cadmium, total recoverable, monthly average	.3	≤ .2 ug/L	50%
October 2025	002	Cobalt, total recoverable, monthly average	1010	≤ 693 ug/L	46%
October 2025	002	Copper, total recoverable, daily maximum	25.7	≤ 15.3 ug/L	68%
October 2025	002	Copper, total recoverable, monthly average	25.7	≤ 5.6 ug/L	359%
October 2025	002	Nickel, total recoverable, daily maximum	1590	≤ 80.9 ug/L	1865%
October 2025	002	Nickel, total recoverable, monthly average	1590	≤ 49.9 ug/L	3086%
November 2025	002	Cadmium, total recoverable, monthly average	.3	≤ .2 ug/L	50%
November 2025	002	Cobalt, total recoverable, monthly average	1050	≤ 693 ug/L	52%
November 2025	002	Copper, total recoverable, daily maximum	28.4	≤ 15.3 ug/L	86%
November 2025	002	Copper, total recoverable, monthly average	28.4	≤ 5.6 ug/L	407%
November 2025	002	Lead, total recoverable, monthly average	6.1	≤ 2.2 ug/L	177%
November 2025	002	Nickel, total recoverable, daily maximum	1620	≤ 80.9 ug/L	1902%
November 2025	002	Nickel, total recoverable, monthly average	1620	≤ 49.9 ug/L	3146%
December 2025	002	Cobalt, total recoverable, monthly average	1000	≤ 693 ug/L	44%
December 2025	002	Copper, total recoverable, daily maximum	28.6	≤ 15.3 ug/L	87%
December 2025	002	Copper, total recoverable, monthly average	28.6	≤ 5.6 ug/L	411%
December 2025	002	Nickel, total recoverable, daily maximum	1630	≤ 80.9 ug/L	1915%
December 2025	002	Nickel, total recoverable, monthly average	1630	≤ 49.9 ug/L	3167%
December 2025	002	Toxicity [acute], Ceriodaphnia dubia, value	> 16	≤ .3 toxic	—
January 2026	001	Chlorides + Sulfates, daily maximum	1085.1	≤ 1000 mg/L	9%
January 2026	001	Chlorides + Sulfates, monthly average	1085.1	≤ 1000 mg/L	9%
January 2026	002	Cobalt, total recoverable, monthly average	1060	≤ 693 ug/L	53%
January 2026	002	Copper, total recoverable, daily maximum	51.9	≤ 15.3 ug/L	239%
January 2026	002	Copper, total recoverable, monthly average	51.9	≤ 5.6 ug/L	827%
January 2026	002	Lead, total recoverable, monthly average	6.4	≤ 2.2 ug/L	191%
January 2026	002	Nickel, total recoverable, daily maximum	1720	≤ 80.9 ug/L	2026%
January 2026	002	Nickel, total recoverable, monthly average	1720	≤ 49.9 ug/L	3347%
February 2026	001	Lead, total recoverable, daily maximum	7.2	≤ 6.5 ug/L	11%
February 2026	001	Lead, total recoverable, monthly average	7.2	≤ 2.2 ug/L	227%
February 2026	002	Cobalt, total recoverable, monthly average	700	≤ 693 ug/L	1%
February 2026	002	Copper, total recoverable, daily maximum	20.6	≤ 15.3 ug/L	35%
February 2026	002	Copper, total recoverable, monthly average	20.6	≤ 5.6 ug/L	268%
February 2026	002	Nickel, total recoverable, daily maximum	1130	≤ 80.9 ug/L	1297%
February 2026	002	Nickel, total recoverable, monthly average	1130	≤ 49.9 ug/L	2165%
March 2026	001	Lead, total recoverable, daily maximum	33.2	≤ 6.5 ug/L	411%
March 2026	001	Lead, total recoverable, monthly average	20.1	≤ 2.2 ug/L	814%
March 2026	001	Solids, total suspended, daily maximum	79	≤ 45 mg/L	76%
March 2026	001	Solids, total suspended, monthly average	42.5	≤ 30 mg/L	42%
March 2026	002	Cadmium, total recoverable, daily maximum	.8	≤ .5 ug/L	60%
March 2026	002	Cadmium, total recoverable, monthly average	.8	≤ .2 ug/L	300%
March 2026	002	Copper, total recoverable, daily maximum	152	≤ 15.3 ug/L	893%
March 2026	002	Copper, total recoverable, monthly average	152	≤ 5.6 ug/L	2614%
March 2026	002	Lead, total recoverable, daily maximum	137	≤ 6.5 ug/L	2008%
March 2026	002	Lead, total recoverable, monthly average	137	≤ 2.2 ug/L	6127%
March 2026	002	Nickel, total recoverable, daily maximum	130	≤ 80.9 ug/L	61%
March 2026	002	Nickel, total recoverable, monthly average	130	≤ 49.9 ug/L	161%
March 2026	002	Solids, total suspended, daily maximum	187	≤ 45 mg/L	316%
March 2026	002	Solids, total suspended, monthly average	187	≤ 30 mg/L	523%
March 2026	002	Toxicity [acute], Ceriodaphnia dubia, value	> 16	≤ .3 toxic	—
March 2026	002	Zinc, total recoverable, daily maximum	174	≤ 130.2 ug/L	34%
March 2026	002	Zinc, total recoverable, monthly average	174	≤ 87 ug/L	100%
April 2026	001	Cadmium, total recoverable, monthly average	< .3	≤ .2 ug/L	50%
April 2026	001	Lead, total recoverable, monthly average	2.3	≤ 2.2 ug/L	5%
April 2026	002	Cadmium, total recoverable, monthly average	< .3	≤ .2 ug/L	50%
April 2026	002	Cobalt, total recoverable, daily maximum	1190	≤ 1103 ug/L	8%
April 2026	002	Cobalt, total recoverable, monthly average	1190	≤ 693 ug/L	72%
April 2026	002	Copper, total recoverable, daily maximum	24.9	≤ 15.3 ug/L	63%
April 2026	002	Copper, total recoverable, monthly average	24.9	≤ 5.6 ug/L	345%
April 2026	002	Lead, total recoverable, monthly average	2.9	≤ 2.2 ug/L	32%
April 2026	002	Nickel, total recoverable, daily maximum	1820	≤ 80.9 ug/L	2150%
April 2026	002	Nickel, total recoverable, monthly average	1820	≤ 49.9 ug/L	3547%
May 2026	001	Chlorides + Sulfates, daily maximum	1040	≤ 1000 mg/L	4%
May 2026	001	Chlorides + Sulfates, monthly average	1040	≤ 1000 mg/L	4%
May 2026	002	Cadmium, total recoverable, daily maximum	.6	≤ .5 ug/L	20%
May 2026	002	Cadmium, total recoverable, monthly average	.6	≤ .2 ug/L	200%
May 2026	002	Cobalt, total recoverable, daily maximum	1240	≤ 1103 ug/L	12%
May 2026	002	Cobalt, total recoverable, monthly average	1240	≤ 693 ug/L	79%
May 2026	002	Copper, total recoverable, daily maximum	15.5	≤ 15.3 ug/L	1%
May 2026	002	Copper, total recoverable, monthly average	15.5	≤ 5.6 ug/L	177%
May 2026	002	Nickel, total recoverable, daily maximum	1780	≤ 80.9 ug/L	2100%
May 2026	002	Nickel, total recoverable, monthly average	1780	≤ 49.9 ug/L	3467%
June 2026	001	Chlorides + Sulfates, daily maximum	1030	≤ 1000 mg/L	3%
June 2026	001	Chlorides + Sulfates, monthly average	1030	≤ 1000 mg/L	3%
June 2026	001	Lead, total recoverable, monthly average	3.2	≤ 2.2 ug/L	45%
June 2026	001	Solids, total suspended, daily maximum	59	≤ 45 mg/L	31%
June 2026	001	Solids, total suspended, monthly average	59	≤ 30 mg/L	97%
June 2026	002	Cadmium, total recoverable, monthly average	.3	≤ .2 ug/L	50%
June 2026	002	Cobalt, total recoverable, monthly average	815	≤ 693 ug/L	18%
June 2026	002	Copper, total recoverable, monthly average	9.6	≤ 5.6 ug/L	71%
June 2026	002	Nickel, total recoverable, daily maximum	1310	≤ 80.9 ug/L	1519%
June 2026	002	Nickel, total recoverable, monthly average	1310	≤ 49.9 ug/L	2525%
June 2026	002	Solids, total suspended, daily maximum	46	≤ 45 mg/L	2%
June 2026	002	Solids, total suspended, monthly average	46	≤ 30 mg/L	53%
June 2026	002	Toxicity [acute], Ceriodaphnia dubia, value	> 16	≤ .3 toxic	—
August 2026	001	Lead, total recoverable, monthly average	3.5	≤ 2.2 ug/L	59%
August 2026	002	Cadmium, total recoverable, monthly average	.4	≤ .2 ug/L	100%
August 2026	002	Copper, total recoverable, monthly average	7.4	≤ 5.6 ug/L	32%
August 2026	002	Lead, total recoverable, daily maximum	38.5	≤ 6.5 ug/L	492%
August 2026	002	Lead, total recoverable, monthly average	38.5	≤ 2.2 ug/L	1650%
August 2026	002	Solids, total suspended, daily maximum	208	≤ 45 mg/L	362%
August 2026	002	Solids, total suspended, monthly average	208	≤ 30 mg/L	593%

Limits in force (84)

Parameter	Statistic	Limit	Months	Outfall
Sulfate [as S]	daily maximum	report only (mg/L)	all year	001
Sulfate [as S]	monthly average	report only (mg/L)	all year	001
pH	minimum	≥ 6.5 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	daily maximum	≤ 45 mg/L	all year	001
Solids, total suspended	monthly average	≤ 30 mg/L	all year	001
Oil and grease [soxhlet extr.] tot.	daily maximum	report only (mg/L)	all year	001
Oil and grease [soxhlet extr.] tot.	monthly average	report only (mg/L)	all year	001
Cyanide, total [as CN]	daily maximum	report only (ug/L)	all year	001
Cyanide, total [as CN]	monthly average	report only (ug/L)	all year	001
Arsenic, total recoverable	daily maximum	report only (ug/L)	all year	001
Arsenic, total recoverable	monthly average	report only (ug/L)	all year	001
Cobalt, total recoverable	daily maximum	≤ 1103 ug/L	all year	001
Cobalt, total recoverable	monthly average	≤ 693 ug/L	all year	001
Nickel, total recoverable	daily maximum	≤ 80.9 ug/L	all year	001
Nickel, total recoverable	monthly average	≤ 49.9 ug/L	all year	001
Zinc, total recoverable	daily maximum	≤ 130.2 ug/L	all year	001
Zinc, total recoverable	monthly average	≤ 87 ug/L	all year	001
Cadmium, total recoverable	daily maximum	≤ .5 ug/L	all year	001
Cadmium, total recoverable	monthly average	≤ .2 ug/L	all year	001
Lead, total recoverable	daily maximum	≤ 6.5 ug/L	all year	001
Lead, total recoverable	monthly average	≤ 2.2 ug/L	all year	001
Chloride	daily maximum	report only (mg/L)	all year	001
Chloride	monthly average	report only (mg/L)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Toxicity [acute], Ceriodaphnia dubia	value	≤ .3 toxic	all year	001
Toxicity [acute], Pimephales promelas [Fathead Minnow]	value	≤ .3 toxic	all year	001
Chlorides + Sulfates	daily maximum	≤ 1000 mg/L	all year	001
Chlorides + Sulfates	monthly average	≤ 1000 mg/L	all year	001
Sulfate [as S]	daily maximum	report only (mg/L)	all year	002
Sulfate [as S]	monthly average	report only (mg/L)	all year	002
pH	minimum	≥ 6.5 SU	all year	002
pH	maximum	≤ 9 SU	all year	002
Solids, total suspended	daily maximum	≤ 45 mg/L	all year	002
Solids, total suspended	monthly average	≤ 30 mg/L	all year	002
Oil and grease [soxhlet extr.] tot.	daily maximum	report only (mg/L)	all year	002
Oil and grease [soxhlet extr.] tot.	monthly average	report only (mg/L)	all year	002
Cyanide, total [as CN]	daily maximum	report only (ug/L)	all year	002
Cyanide, total [as CN]	monthly average	report only (ug/L)	all year	002
Cobalt, total recoverable	daily maximum	≤ 1103 ug/L	all year	002
Cobalt, total recoverable	monthly average	≤ 693 ug/L	all year	002
Arsenic, total [as As]	daily maximum	report only (ug/L)	all year	002
Arsenic, total [as As]	monthly average	report only (ug/L)	all year	002
Nickel, total recoverable	daily maximum	≤ 80.9 ug/L	all year	002
Nickel, total recoverable	monthly average	≤ 49.9 ug/L	all year	002
Zinc, total recoverable	daily maximum	≤ 130.2 ug/L	all year	002
Zinc, total recoverable	monthly average	≤ 87 ug/L	all year	002
Cadmium, total recoverable	daily maximum	≤ .5 ug/L	all year	002
Cadmium, total recoverable	monthly average	≤ .2 ug/L	all year	002
Lead, total recoverable	daily maximum	≤ 6.5 ug/L	all year	002
Lead, total recoverable	monthly average	≤ 2.2 ug/L	all year	002
Copper, total recoverable	daily maximum	≤ 15.3 ug/L	all year	002
Copper, total recoverable	monthly average	≤ 5.6 ug/L	all year	002
Chloride	daily maximum	report only (mg/L)	all year	002
Chloride	monthly average	report only (mg/L)	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	002
Toxicity [acute], Ceriodaphnia dubia	value	≤ .3 toxic	all year	002
Toxicity [acute], Pimephales promelas [Fathead Minnow]	value	≤ .3 toxic	all year	002
Chlorides + Sulfates	daily maximum	≤ 1000 mg/L	all year	002
Chlorides + Sulfates	monthly average	≤ 1000 mg/L	all year	002
Freeboard	daily minimum	≥ 2 ft	all year	006
Freeboard	monthly average	report only (ft)	all year	006
Oxygen demand, chem. [high level] [COD]	daily maximum	report only (mg/L)	all year	008
pH	minimum	report only (SU)	all year	008
pH	maximum	report only (SU)	all year	008
Solids, total suspended	daily maximum	report only (mg/L)	all year	008
Oil and grease [soxhlet extr.] tot.	daily maximum	report only (mg/L)	all year	008
Cyanide, total [as CN]	daily maximum	report only (ug/L)	all year	008
Arsenic, total recoverable	daily maximum	report only (ug/L)	all year	008
Cobalt, total recoverable	daily maximum	report only (ug/L)	all year	008
Nickel, total recoverable	daily maximum	report only (ug/L)	all year	008
Zinc, total recoverable	daily maximum	report only (ug/L)	all year	008
Cadmium, total recoverable	daily maximum	report only (ug/L)	all year	008
Lead, total recoverable	daily maximum	report only (ug/L)	all year	008
Copper, total recoverable	daily maximum	report only (ug/L)	all year	008
Storm water flow	daily maximum	report only (MGD)	all year	008
Freeboard	daily minimum	≥ 2 ft	all year	009
Freeboard	monthly average	report only (ft)	all year	009
Sulfate [as S]	daily maximum	report only (mg/L)	all year	MDW
Sulfate [as S]	monthly average	report only (mg/L)	all year	MDW
Chlorides + Sulfates	daily maximum	report only (mg/L)	all year	MDW
Chlorides + Sulfates	monthly average	report only (mg/L)	all year	MDW

Parameter	New limit	New or tighter	Median, last 12 months	× new limit
Cyanide, total [as CN], daily maximum	8.5 ug/L	new	—	—
Cyanide, total [as CN], monthly average	4.3 ug/L	new	—	—

Parameter

New limit

New or tighter

Median, last 12 months

× new limit

Cyanide, total [as CN], daily maximum

8.5 ug/L

new

—

Cyanide, total [as CN], monthly average

4.3 ug/L

new

—

How strict are these limits?

Cadmium, total recoverable, monthly average .2 ug/L — stricter than 89% of 55 other major industrial and other permits nationwide

Lead, total recoverable, monthly average 2.2 ug/L — stricter than 87% of 78 other major industrial and other permits nationwide

Cadmium, total recoverable, daily maximum .5 ug/L — stricter than 86% of 67 other major industrial and other permits nationwide

Your permit document is the final word. As JSON: /api/v1/permits/MO0098752 · MCP: https://passage-data.com/mcp

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

Limits in force (84)

New limits from Jul 1, 2027

How strict are these limits?