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Chang Farms

Food Crops Grown Under Cover, Whatley, Massachusetts. NPDES permit MA0040207, in force until Apr 30, 2027. Last 12 months: over a limit 7 times (last August 2026), 3 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (21 values), form Q quarterly (1 value), form T quarterly, form TA quarterly
Renewal application due
Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 4 of 20 reports late

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

Period endingParameterReportedLimitOver by
October 2025E. coli, daily maximum820 CFU/100mL≤ 409 CFU/100mL100%
October 2025E. coli, monthly average164.5 CFU/100mL≤ 126 CFU/100mL31%
April 2026E. coli, daily maximum460 CFU/100mL≤ 409 CFU/100mL12%
April 2026Solids, total suspended, daily maximum24 mg/L≤ 23.2 mg/L3%
May 2026BOD, 5-day, 20 deg. C, daily maximum45 mg/L≤ 41.5 mg/L8%
July 2026E. coli, daily maximum440 CFU/100mL≤ 409 CFU/100mL8%
August 2026BOD, 5-day, 20 deg. C, daily maximum50 mg/L≤ 41.5 mg/L20%

Limits in force (42)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)May–Oct
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximum≤ .65 MGDall year
BOD, 5-day, 20 deg. Cmonthly average≤ 26.6 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 41.5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 144 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 225 lb/dall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.3 SUall year
pHdaily maximumreport only (SU)May–Oct
Solids, total suspendedmonthly average≤ 15.5 mg/Lall year
Solids, total suspendeddaily maximum≤ 23.2 mg/Lall year
Solids, total suspendedmonthly average≤ 84 lb/dall year
Solids, total suspendeddaily maximum≤ 126 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]rolling average≤ 12.4 lb/dall year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May–Oct
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)Mar, Jun, Sep, Dec
Hardness, total [as CaCO3]daily maximumreport only (mg/L)May–Oct
Hardness, total [as CaCO3]daily maximumreport only (mg/L)May–Oct
Cadmium, total [as Cd]daily maximumreport only (mg/L)May–Oct
Cadmium, total [as Cd]daily maximumreport only (mg/L)May–Oct
Copper, total [as Cu]daily maximumreport only (mg/L)May–Oct
Copper, total [as Cu]daily maximumreport only (mg/L)May–Oct
Lead, total [as Pb]daily maximumreport only (mg/L)May–Oct
Lead, total [as Pb]daily maximumreport only (mg/L)May–Oct
Nickel, total [as Ni]daily maximumreport only (mg/L)May–Oct
Nickel, total [as Ni]daily maximumreport only (mg/L)May–Oct
Zinc, total [as Zn]daily maximumreport only (mg/L)May–Oct
Zinc, total [as Zn]daily maximumreport only (mg/L)May–Oct
Aluminum, total [as Al]daily maximumreport only (mg/L)May–Oct
Aluminum, total [as Al]daily maximumreport only (mg/L)May–Oct
Chlorine, total residualmonthly average≤ 1 mg/Lall year
Chlorine, total residualdaily maximum≤ 1 mg/Lall year
E. colimonthly average≤ 126 CFU/100mLApr–Oct
E. colidaily maximum≤ 409 CFU/100mLApr–Oct
LC50 Static 48Hr Acute Ceriodaphnia dubiaminimum≥ 50 %May–Oct
LC50 Static 48Hr Acute Pimephales promelasminimum≥ 50 %May–Oct

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MA0040207 · MCP: https://passage-data.com/mcp