PRASA ISABELA WTP
NPDES ID: PR0026638
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 2 effluent violations, 3 reporting violations.
Violations
June 30, 2026
Nitrogen, total [as N]
308% over limit
Discharged 6.94000033 mg/L against a permitted limit of 1.70000008 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
11% over limit
Discharged 1.11000005 mg/L against a permitted limit of 1.00000005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Lead, total [as Pb]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Whole Effluent Toxicity [WET] - P. promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (MINIMUM)
DMR, Monitor Only - Overdue
Whole Effluent Toxicity [WET] - D. magna
0% over limit
Discharged 0 % against a permitted limit of 0 % (MINIMUM)
DMR, Monitor Only - Overdue
February 28, 2026
BOD, 5-day, 20 deg. C
10% over limit
Discharged 9.6 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
10% over limit
Discharged 9.6 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
10% over limit
Discharged 9.6 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
10% over limit
Discharged 9.6 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
10% over limit
Discharged 9.6 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
38% over limit
Discharged 1.38000007 mg/L against a permitted limit of 1.00000005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
38% over limit
Discharged 1.38000007 mg/L against a permitted limit of 1.00000005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
38% over limit
Discharged 1.38000007 mg/L against a permitted limit of 1.00000005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
38% over limit
Discharged 1.38000007 mg/L against a permitted limit of 1.00000005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
38% over limit
Discharged 1.38000007 mg/L against a permitted limit of 1.00000005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
BOD, 5-day, 20 deg. C
13% over limit
Discharged 9.84 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
833% over limit
Discharged 0.07 mg/L against a permitted limit of 0.0075 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
833% over limit
Discharged 0.07 mg/L against a permitted limit of 0.0075 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
833% over limit
Discharged 0.07 mg/L against a permitted limit of 0.0075 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
833% over limit
Discharged 0.07 mg/L against a permitted limit of 0.0075 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
833% over limit
Discharged 0.07 mg/L against a permitted limit of 0.0075 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Chlorine, total residual
1100% over limit
Discharged 0.09 mg/L against a permitted limit of 0.0075 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
1100% over limit
Discharged 0.09 mg/L against a permitted limit of 0.0075 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
1100% over limit
Discharged 0.09 mg/L against a permitted limit of 0.0075 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
1100% over limit
Discharged 0.09 mg/L against a permitted limit of 0.0075 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
1100% over limit
Discharged 0.09 mg/L against a permitted limit of 0.0075 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Phosphorus, total [as P]
12% over limit
Discharged 1.12000005 mg/L against a permitted limit of 1.00000005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
BOD, 5-day, 20 deg. C
45% over limit
Discharged 12.6 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
BOD, 5-day, 20 deg. C
49% over limit
Discharged 13 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
BOD, 5-day, 20 deg. C
30% over limit
Discharged 11.3 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Phosphorus, total [as P]
109% over limit
Discharged 2.0900001 mg/L against a permitted limit of 1.00000005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
72% over limit
Discharged 15 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
BOD, 5-day, 20 deg. C
2279% over limit
Discharged 207 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
BOD, 5-day, 20 deg. C
153% over limit
Discharged 22 mg/L against a permitted limit of 8.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (4 hours ago)