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Dallas, City of

Sewage treatment plant, major discharger, Dallas, Oregon. NPDES permit OR0020737, in force until Oct 31, 2030. Last 12 months: over a limit 6 times (last September 2026), 3 of 42 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (45 values), form G monthly (6 values), form RW monthly (4 values), form ZN quarterly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 1 required value missing, 3 of 48 reports late

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

Period endingParameterReportedLimitOver by
February 2026pH range excursions, > 60 minutes, total1 occur/mo≤ 0 occur/mo—
February 2026pH range excursions, monthly total accum, total870 min≤ 446 min95%
July 2026Nitrogen, ammonia total [as N], monthly average1.8 mg/L≤ 1.3 mg/L38%
August 2026Nitrogen, ammonia total [as N], monthly average2.3 mg/L≤ 1.3 mg/L77%
September 2026Nitrogen, ammonia total [as N], daily maximum22.4 mg/L≤ 6.9 mg/L225%
September 2026Nitrogen, ammonia total [as N], monthly average19.1 mg/L≤ 2.3 mg/L730%

Limits in force (83)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigrademaximum 7-day averagereport only (deg C)all year
Flow ratemonthly averagereport only (cfs)all year
Flow ratedaily maximumreport only (cfs)all year
Oxygen, dissolved [DO]daily average minimum≥ 6.5 mg/Lall year
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all year
Oxygen, dissolved percent saturationdaily average minimumreport only (%)all year
pHmonthly minimumreport only (SU)all year
pHmonthly maximumreport only (SU)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 8.5 SUall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly average≤ 10 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 230 lb/dMay–Oct
Solids, total suspendedmonthly average≤ 1300 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 450 lb/dMay–Oct
Solids, total suspendeddaily maximum≤ 2500 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 10 mg/LMay–Oct
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedmonthly average≤ 270 lb/dMay–Oct
Solids, total suspendedmonthly average≤ 1400 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendeddaily maximum≤ 630 lb/dMay–Oct
Solids, total suspendeddaily maximum≤ 3500 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 15 mg/LMay–Oct
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 340 lb/dMay–Oct
Solids, total suspendedweekly average≤ 1900 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 15 mg/LMay–Oct
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Apr, Nov, Dec
Solids, total suspendedweekly average≤ 440 lb/dMay–Oct
Solids, total suspendedweekly average≤ 2300 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 4.1 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 9.6 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 11.8 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Zinc, dissolved [as Zn]valuereport only (ug/L)all year
Zinc, total [as Zn]valuereport only (ug/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 406 #/100mLall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximumreport only (#/100mL)all year
Excess thermal loadmaximum 7-day averagereport only (mkcal/day)May–Oct
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 230 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1000 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 450 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 2100 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 270 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 630 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 3500 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 340 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1600 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]weekly average≤ 440 lb/dMay–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 2300 lb/dJan, Feb, Mar, Apr, Nov, Dec
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 85 %all year

How strict are these limits?

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

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