PRETREATMENT RATIONALE FOR ISSUANCE

EcoWater Systems LLC
Tippah
Ripley, MS
Water I Branch

MSP092479
SIC: 3589
February 2025
Permit Engineer: Samar Patel

I.	FACILITY INFORMATION

A.	Nature of Business: Water Softening Equipment Manufacturing Facility
B.	Process Wastewater Description: Wastewater generated from their laboratory operations. The site is planning to add a new research and testing laboratory that will generate process wastewater that when combined with existing wastewater received by the City of Ripley POTW, will exceed 25,000 gallon per day, which requires them to have a pretreatment permit. The process wastewater primarily includes water contacting the filter media and other components of the parts manufactured at the site. 
C.	Proposed Flowrate: 34,000 gallons per day
D.	Applicable Federal Guidelines: None. 

II.	RECEIVING POTW INFORMATION

A.	POTW Name, Agency Interest No., and Permit No.: Ripley POTW; AI# 13363; MS0020958
B.	POTW Treatment Type: Two facultative lagoons followed by three sand filters and UV disinfection.
C.	POTW Design Flowrate: 2.00 MGD or 3.10 cfs
D.	POTW Receiving Stream: Phyfer Creek
E.	POTW Receiving Stream 7Q10 (Q7/10): 0.0 cfs

III.	APPLICATION DATA

Parameter	Maximum Daily Value	
BOD (mg/L)	<1.00	
COD (mg/L)	< 3.00	
TSS (mg/L)	2.00	
Ammonia (as N) (mg/L)	<0.200	
Flow (gpm)	0.034 (Proposed)	
Temperature (winter)	70°F	
Temperature (summer)	75°F	
pH (S.U.)	8.96 (max)	
Chlorine (mg/L)	0.03	
Fluoride (mg/L)	0.156	
Nitrate-Nitrite (mg/L)	<0.10	
Nitrogen, Total Organic (as N) (mg/L)	<1.0	
Oil and Grease (mg/L)	<4.60	
Phosphorus, Total (as P) (mg/L)	<0.05	
Sulfate (as SO4) (mg/L)	<1.00	
Sulfide (mg/L)	< 0.002	
Sulfite (as SO3) (mg/L)	< 3.00	
Total Barium (mg/L)	<0.004	
Iron, Total (mg/L)	0.0746	

IV.	Proposed Permit Limits
Parameter	Current Permit 
Limits (CPL)	Proposed Permit 
Limits (PPL)	Basis1	
	Avg. (mg/L)	Max. (mg/L)	Avg. (mg/L)	Max. (mg/L)		
Flow	--	--	Report MGD	0.034 MGD	EJ	
pH	--	--	6.0 (min.) SU	9.0 (max.) SU	WQC	

1	Basis of Decision: EJ – Engineering Judgment; WQC = Water Quality Criteria

•	The permittee must comply with the general pretreatment regulations established in 40 CFR 403.

•	The Flow shall be monitored daily utilizing a flow meter. pH shall be monitored twice per monthly via a grab sample.

•	Metals are believed to be absent, and due to a very small discharge from Ecowater Systems, MDEQ does not believe they need to be evaluated for metals contribution.  

•	Public notice will be required for this permit issuance.  

V.