Water & Power Authority — NPDES permit VI0000051: limits, due date and EPA's record

Electric Services, major discharger, St. Croix, the U.S. Virgin Islands. NPDES permit VI0000051, in force until Oct 31, 2029. Last 12 months: over a limit 23 times (last September 2026), 40 required values missing, 8 of 112 reports late. Source: EPA ECHO, Oct 22, 2026.

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

Limits in force (70)

Period ending	Outfall	Parameter	Reported	Limit	Over by
October 2025	001	Chlorine, total residual, daily maximum	.9 mg/L	≤ .012 mg/L	7400%
October 2025	001	Chlorine, total residual, maximum	.9 mg/L	≤ .2 mg/L	350%
October 2025	001	Chlorine, total residual, monthly average	.075 mg/L	≤ .0062 mg/L	1110%
November 2025	001	Chlorine, total residual, daily maximum	.17 mg/L	≤ .012 mg/L	1317%
November 2025	001	Chlorine, total residual, monthly average	.053 mg/L	≤ .0062 mg/L	755%
November 2025	001	pH, minimum	6.2 SU	≥ 6.7 SU	—
December 2025	001	Chlorine, total residual, daily maximum	.14 mg/L	≤ .012 mg/L	1067%
December 2025	001	Chlorine, total residual, monthly average	.063 mg/L	≤ .0062 mg/L	916%
December 2025	001	pH, minimum	6.4 SU	≥ 6.7 SU	—
January 2026	001	Chlorine, total residual, daily maximum	.14 mg/L	≤ .012 mg/L	1067%
January 2026	001	Chlorine, total residual, monthly average	.054 mg/L	≤ .0062 mg/L	771%
January 2026	004	pH, maximum	8.7 SU	≤ 8.5 SU	—
February 2026	001	Chlorine, total residual, daily maximum	.17 mg/L	≤ .012 mg/L	1317%
February 2026	001	Chlorine, total residual, monthly average	.072 mg/L	≤ .0062 mg/L	1061%
February 2026	001	pH, minimum	6.4 SU	≥ 6.7 SU	—
March 2026	001	Chlorine, total residual, monthly average	.054 mg/L	≤ .0062 mg/L	771%
March 2026	004	pH, maximum	8.8 SU	≤ 8.5 SU	—
June 2026	003	Solids, total suspended, daily average	53.5 mg/L	≤ 30 mg/L	78%
June 2026	003	Solids, total suspended, daily maximum	53.5 mg/L	≤ 20 mg/L	168%
August 2026	001	pH, maximum	9.3 SU	≤ 8.5 SU	—
August 2026	002	pH, maximum	9.3 SU	≤ 8.5 SU	—
September 2026	001	pH, maximum	9 SU	≤ 8.5 SU	—
September 2026	002	pH, maximum	9.2 SU	≤ 8.5 SU	—

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. centigrade	monthly average	report only (deg C)	all year	001
Temperature, water deg. centigrade	daily maximum	report only (deg C)	all year	001
Temp. diff. between samp. & upstrm deg. C	48-hour maximum	≤ 11.1 deg C	all year	001
Temp. diff. between samp. & upstrm deg. C	monthly maximum	≤ 8.3 deg C	all year	001
pH	minimum	≥ 6.7 SU	all year	001
pH	minimum	≥ 6.7 SU	all year	001
pH	maximum	≤ 8.5 SU	all year	001
pH	maximum	≤ 8.5 SU	all year	001
Solids, total suspended	monthly average	≤ 30 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 50 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 8618 kg/d	all year	001
Oil & Grease	monthly average	≤ 15 mg/L	all year	001
Oil & Grease	daily maximum	≤ 10 mg/L	all year	001
Oil & Grease	daily maximum	≤ 15 mg/L	all year	001
Whole effluent toxicity	daily maximum	report only (%)	all year	001
Priority Pollutants	daily maximum	report only (ug/L)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Chlorine, total residual	monthly average	≤ .0062 mg/L	all year	001
Chlorine, total residual	daily maximum	≤ .012 mg/L	all year	001
Chlorine, total residual	maximum	≤ .2 mg/L	all year	001
Chlorine, free available	daily maximum	≤ .2 mg/L	all year	001
Chlorine, free available	maximum	≤ .5 mg/L	all year	001
Storm water flow	maximum	report only (MGD)	all year	001
pH	minimum	≥ 6.7 SU	all year	002
pH	minimum	≥ 6.7 SU	all year	002
pH	maximum	≤ 8.5 SU	all year	002
pH	maximum	≤ 8.5 SU	all year	002
Solids, total suspended	daily average	≤ 30 mg/L	all year	002
Solids, total suspended	daily maximum	≤ 20 mg/L	all year	002
Solids, total suspended	daily maximum	≤ 50 mg/L	all year	002
Oil & Grease	daily average	≤ 15 mg/L	all year	002
Oil & Grease	daily maximum	≤ 10 mg/L	all year	002
Oil & Grease	daily maximum	≤ 15 mg/L	all year	002
Copper, total [as Cu]	monthly average	≤ 1.9 mg/L	all year	002
Copper, total [as Cu]	daily maximum	≤ 5.8 mg/L	all year	002
Iron, total [as Fe]	daily maximum	≤ 1 mg/L	all year	002
Aluminum, total [as Al]	daily maximum	≤ 3 mg/L	all year	002
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
Storm water flow	maximum	report only (MGD)	all year	002
pH	minimum	≥ 6.7 SU	all year	003
pH	minimum	≥ 6.7 SU	all year	003
pH	maximum	≤ 8.5 SU	all year	003
pH	maximum	≤ 8.5 SU	all year	003
Solids, total suspended	daily average	≤ 30 mg/L	all year	003
Solids, total suspended	daily maximum	≤ 20 mg/L	all year	003
Solids, total suspended	daily maximum	≤ 50 mg/L	all year	003
Oil & Grease	daily average	≤ 15 mg/L	all year	003
Oil & Grease	daily maximum	≤ 10 mg/L	all year	003
Oil & Grease	daily maximum	≤ 15 mg/L	all year	003
Phosphorus, total [as P]	monthly average	≤ .05 ug/L	all year	003
Phosphorus, total [as P]	daily maximum	≤ .1 ug/L	all year	003
Copper, total [as Cu]	monthly average	≤ 2.3 mg/L	all year	003
Copper, total [as Cu]	daily maximum	≤ 5.8 mg/L	all year	003
Iron, total [as Fe]	daily maximum	≤ 1 mg/L	all year	003
Aluminum, total [as Al]	daily maximum	≤ 3 mg/L	all year	003
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	003
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	003
Storm water flow	maximum	report only (MGD)	all year	003
pH	minimum	≥ 6.7 SU	all year	004
pH	maximum	≤ 8.5 SU	all year	004
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	004
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	004
pH	minimum	≥ 6.7 SU	all year	005
pH	maximum	≤ 8.5 SU	all year	005
Solids, total suspended	daily maximum	≤ 50 mg/L	all year	005
Oil & Grease	daily maximum	≤ 15 mg/L	all year	005
Storm water flow	maximum	report only (MGD)	all year	005

How strict are these limits?

Cited limits by parameter: we hold no rule of the U.S. Virgin Islands's own; the federal ones.

Your permit document is the final word. As JSON: /api/v1/permits/VI0000051 · MCP: https://passage-data.com/mcp