Clean Water Act discharge permit · NPDES MAR1005UN

160 MAPLE ST (SYSTEM #1) PHOTOVOLTAIC ARRAY, Franklin, MA: NPDES MAR1005UN discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

160 MAPLE ST (SYSTEM #1) PHOTOVOLTAIC ARRAY, held by Helios Energy, holds NPDES permit MAR1005UN. EPA’s file records it issued August 12, 2025 and expiring February 16, 2027.

160 MAPLE ST (SYSTEM #1) PHOTOVOLTAIC ARRAY, Franklin, Massachusetts: Coverage under a general permit MAR1005UN, held by Helios Energy; Construction stormwater; Effective; issued August 12, 2025, term to February 16, 2027, by U.S. EPA.

Massachusetts holds 3,320 Construction stormwater coverages of this permit type in EPA’s file; 2,551 were issued before MAR1005UN. Helios Energy holds 3 permits in Massachusetts.

Other permits held by Helios Energy

160 MAPLE ST (SYSTEM #3) PHOTOVOLTIAC SOLAR ARRAY, Bellingham: MAR1005UM, issued August 12, 2025
GLENVIEW LANDFILL - PROPOSED CAP MODIFICATION & SOLAR PHOTOVOLTAIC FACILITY, Chelmsford: MAR1006GC, issued August 7, 2026

Coverages issued nearest MAR1005UN

August 11, 2025: MPA CONTRACT NO. H296-C1 HANSCOM AIRPORT, Bedford, MAR1005VK, held by J.H. Lynch & Sons, Inc.
August 11, 2025: CLINTON MIDDLE SCHOOL, Clinton, MAR1005VO, held by Fontaine Bros, Inc.
August 11, 2025: MONTROSE SCHOOL CAMPUS IMPROVEMENT PROJECT, Medfield, MAR1005VP, held by R.A.D. Sports
August 11, 2025: TABLE TALK SQUARE RESIDENCES - 120 WASHINGTON STREET, Worcester, MAR1005VQ, held by Feeney Brothers Utility Services
August 12, 2025: 160 MAPLE ST (SYSTEM #3) PHOTOVOLTIAC SOLAR ARRAY, Bellingham, MAR1005UM, held by Helios Energy
August 12, 2025: SPRINGFIELD GROUND MOUNTED SOLAR ARRAY, Springfield, MAR1005VD, held by Coffeetree Solar LLC
August 12, 2025: FORMER LINCOLN LANDFILL SOLAR DEVELOPMENT, Lincoln, MAR1005VE, held by Lincoln Solar 1, LLC
August 12, 2025: MARSHFIELD LANDFILL SOLAR PV PROJECT, Marshfield, MAR1005VG, held by NextGrid NFF Marshfield LLC
August 12, 2025: PEPPERELL SOLAR PV DEVELOPMENT, Pepperell, MAR1005VH, held by Waxmyrtle Solar, LLC
August 12, 2025: 268 STEVENS STREET PUMP STATION, Barnstable, MAR1005VM, held by CC Construction

160 MAPLE ST (SYSTEM #1) PHOTOVOLTAIC ARRAY among its neighbors

EPA’s permit file holds 109 discharge permits in the Headwaters Charles River subwatershed (HUC 010900010601), MAR1005UN among them.

Other permits in the Headwaters Charles River subwatershed (HUC 010900010601)

0 HOWARD STREET, MILFORD, Milford: MAR1004SM, minor permit, permit term to February 16, 2027
121 GROVE STREET, FRANKLIN MA, Franklin: MAR1005MA, minor permit, permit term to February 16, 2027
15 LIBERTY PARKING EXPANSION, Franklin: MAR100695, minor permit, permit term to February 16, 2027
15 LIBERTY WAY, FRANKLIN, MA, Franklin: MANOEJ0DJ, minor permit, permit term to July 31, 2029
151 GROVE STREET, FRANKLIN MA, Franklin: MAR10062P, minor permit, permit term to February 16, 2027
160 MAPLE ST (SYSTEM #3) PHOTOVOLTIAC SOLAR ARRAY, Bellingham: MAR1005UM, minor permit, permit term to February 16, 2027
20 MILFORD STREET, Medway: MAR1005WL, minor permit, permit term to February 16, 2027
240 SOUTH MAIN STREET, Hopedale: MAR1004XE, minor permit, permit term to February 16, 2027
25 FORGE PARKWAY, Franklin: MAR1004WE, minor permit, permit term to February 16, 2027
31 BEAVER STREET, MILFORD, MA, Milford: MAR1005A5, minor permit, permit term to February 16, 2027

What the register holds for 160 MAPLE ST (SYSTEM #1) PHOTOVOLTAIC ARRAY: its NPDES ID, its permit type and status, its dates, its address in Franklin, Massachusetts. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES MAR1005UN.

Identity

Facility as filed	160 MAPLE ST (SYSTEM #1) PHOTOVOLTAIC ARRAY
Permittee as filed	Helios Energy
NPDES ID	MAR1005UN
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Construction stormwater
Issued	August 12, 2025
Expiration date	February 16, 2027
Issuing agency	U.S. EPA
Address	Franklin, MA 02038
Receiving water impaired	303(D) Listed
Subwatershed	Headwaters Charles River (HUC 010900010601)

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES MAR1005UN.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES MAR1005UN.

Inspections

EPA’s inspection file holds no inspection for NPDES MAR1005UN.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES MAR1005UN.

Watch this permit

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

160 MAPLE ST (SYSTEM #1) PHOTOVOLTAIC ARRAY sits among 22 storm water construction permits in Franklin, and 0.0% of them have a violation on file. The Headwaters Charles River subwatershed holds 109 NPDES permits, including this one. Counting this one, 68.2% of Franklin's 22 such permits were issued earlier.