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Harris Cid No 18

Sewage treatment plant, major discharger, Houston, Texas. NPDES permit TX0132471, in force until May 2, 2029. Last 12 months: over a limit 3 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 20 days after each period: form A monthly (16 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 5 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
July 2026	Nitrogen, ammonia total [as N], daily average	5.09 mg/L	≤ 3 mg/L	70%
July 2026	Nitrogen, ammonia total [as N], daily maximum	26.5 mg/L	≤ 10 mg/L	165%
August 2026	E. coli, daily maximum	610 MPN/100mL	≤ 200 MPN/100mL	205%

Limits in force (16)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	monthly minimum	≥ 6 mg/L	all year
pH	minimum	≥ 6 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	daily average	≤ 15 mg/L	all year
Solids, total suspended	daily maximum	≤ 40 mg/L	all year
Solids, total suspended	daily average	≤ 97 lb/d	all year
Nitrogen, ammonia total [as N]	daily average	≤ 3 mg/L	all year
Nitrogen, ammonia total [as N]	daily maximum	≤ 10 mg/L	all year
Nitrogen, ammonia total [as N]	daily average	≤ 19 lb/d	all year
Flow, in conduit or thru treatment plant	daily average	≤ .775 MGD	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
E. coli	daily average	≤ 63 MPN/100mL	all year
E. coli	daily maximum	≤ 200 MPN/100mL	all year
BOD, carbonaceous [5 day, 20 C]	daily average	≤ 10 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 25 mg/L	all year
BOD, carbonaceous [5 day, 20 C]	daily average	≤ 65 lb/d	all year

New limits from Jun 1, 2027

Parameter	New limit	New or tighter	Median, last 12 months	× new limit
BOD, carbonaceous [5 day, 20 C], daily average	32 lb/d	tighter	8.785 lb/d (12 values, 5 below detection)	0.275×
BOD, carbonaceous [5 day, 20 C], daily average	5 mg/L	tighter	2.05 mg/L (12 values, 6 below detection)	—
BOD, carbonaceous [5 day, 20 C], daily maximum	20 mg/L	tighter	2.25 mg/L (12 values, 7 below detection)	—
Nitrogen, ammonia total [as N], daily average	12 lb/d	tighter	1.245 lb/d (12 values)	0.104×
Nitrogen, ammonia total [as N], daily average	1.8 mg/L	tighter	0.392 mg/L (12 values)	0.218×
Solids, total suspended, daily average	32 lb/d	tighter	4.435 lb/d (12 values, 1 below detection)	0.139×
Solids, total suspended, daily average	5 mg/L	tighter	1.075 mg/L (12 values, 2 below detection)	0.215×
Solids, total suspended, daily maximum	20 mg/L	tighter	1.47 mg/L (12 values, 2 below detection)	0.0735×

How strict are these limits?

Oxygen, dissolved [DO], monthly minimum at least 6 mg/L — stricter than 58% of 537 other major POTWs in Texas; 42% have the same limit
E. coli, daily average 63 MPN/100mL — stricter than 40% of 81 other major POTWs in Texas; 59% have the same limit
E. coli, daily maximum 200 MPN/100mL — stricter than 39% of 78 other major POTWs in Texas; 60% have the same limit

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

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Your permit document is the final word. As JSON: /api/v1/permits/TX0132471 · MCP: https://passage-data.com/mcp