PRASA MAUNABO WWTP
NPDES ID: PR0020656
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
This quarter: 18 effluent violations.
Violations
May 31, 2026
Phosphorus, total [as P]
963% over limit
Discharged 1.70000008 mg/L against a permitted limit of 0.16000001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Enterococci
614% over limit
Discharged 250 MPN/100mL against a permitted limit of 35 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
1018% over limit
Discharged 19.0000009 mg/L against a permitted limit of 1.70000008 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Ammonia & ammonium- total
18259160% over limit
Discharged 14.7900007 mg/L against a permitted limit of 0.000081 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Enterococci
1008% over limit
Discharged 1441 MPN/100mL against a permitted limit of 130 MPN/100mL (90TH %)
DMR, Limited - Numeric Violation
April 30, 2026
Phosphorus, total [as P]
3% over limit
Discharged 3.8 mg/L against a permitted limit of 3.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
3% over limit
Discharged 3.8 mg/L against a permitted limit of 3.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
3% over limit
Discharged 3.8 mg/L against a permitted limit of 3.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
3% over limit
Discharged 3.8 mg/L against a permitted limit of 3.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
3% over limit
Discharged 3.8 mg/L against a permitted limit of 3.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
25% over limit
Discharged 25 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
44% over limit
Discharged 65 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
113% over limit
Discharged 68 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
40% over limit
Discharged 79 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
March 31, 2026
Copper, total [as Cu]
25% over limit
Discharged 0.03618 mg/L against a permitted limit of 0.02888 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
25% over limit
Discharged 0.03618 mg/L against a permitted limit of 0.02888 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
25% over limit
Discharged 0.03618 mg/L against a permitted limit of 0.02888 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
25% over limit
Discharged 0.03618 mg/L against a permitted limit of 0.02888 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
25% over limit
Discharged 0.03618 mg/L against a permitted limit of 0.02888 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
7% over limit
Discharged 84 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
40% over limit
Discharged 28 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
40% over limit
Discharged 28 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
40% over limit
Discharged 28 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
40% over limit
Discharged 28 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
40% over limit
Discharged 28 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
107% over limit
Discharged 69 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, 5-day, 20 deg. C
16% over limit
Discharged 52 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
16% over limit
Discharged 52 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
16% over limit
Discharged 52 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
16% over limit
Discharged 52 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
16% over limit
Discharged 52 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
73% over limit
Discharged 74 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
220% over limit
Discharged 52 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
45% over limit
Discharged 29 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
45% over limit
Discharged 29 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
45% over limit
Discharged 29 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
45% over limit
Discharged 29 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
45% over limit
Discharged 29 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
BOD, 5-day, percent removal
200% over limit
Discharged 55 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
24% over limit
Discharged 56 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
24% over limit
Discharged 56 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
24% over limit
Discharged 56 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
24% over limit
Discharged 56 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
24% over limit
Discharged 56 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
73% over limit
Discharged 74 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
25% over limit
Discharged 25 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
25% over limit
Discharged 25 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
25% over limit
Discharged 25 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
25% over limit
Discharged 25 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
25% over limit
Discharged 25 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Phosphorus, total [as P]
42% over limit
Discharged 5.24 mg/L against a permitted limit of 3.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
167% over limit
Discharged 120 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
14% over limit
Discharged 194 kg/d against a permitted limit of 170.3 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
13% over limit
Discharged 34 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
107% over limit
Discharged 69 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
November 30, 2024
BOD, 5-day, percent removal
113% over limit
Discharged 68 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
7% over limit
Discharged 84 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
20% over limit
Discharged 24 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
BOD, 5-day, 20 deg. C
70% over limit
Discharged 34 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
140% over limit
Discharged 64 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
64% over limit
Discharged 74 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
August 31, 2024
BOD, 5-day, percent removal
33% over limit
Discharged 80 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)