NORTHWEST ARKANSAS CONSERVATION AUTHORITY -REGIONAL WWTP
NPDES ID: AR0050024
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: 6 effluent violations, 16 reporting violations.
Violations
May 31, 2026
Phosphorus, total [as P]
60% over limit
Discharged 0.16 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
101% over limit
Discharged 2.73307998 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
27% over limit
Discharged 0.19 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Phosphorus, total [as P]
640% over limit
Discharged 10.07879992 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
490% over limit
Discharged 0.59 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
520% over limit
Discharged 0.93 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Phosphorus, total [as P]
1287% over limit
Discharged 2.08 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
1% over limit
Discharged 6.95 mg/L against a permitted limit of 7 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia
0% over limit
Discharged 0 % against a permitted limit of 0 % (7 DA MIN)
DMR, Monitor Only - Overdue
Whole Effluent Toxicity - Retest #3
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (7 DA MIN)
DMR, Monitor Only - Overdue
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia
0% over limit
Discharged 0 % against a permitted limit of 0 % (7 DA MIN)
DMR, Monitor Only - Overdue
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (7 DA MIN)
DMR, Monitor Only - Overdue
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (7 DA MIN)
DMR, Monitor Only - Overdue
WET, sublethal retest #1
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (7 DA MIN)
DMR, Monitor Only - Overdue
Coef Of Var Static Renewal 7Day Chronic Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (7 DA MIN)
DMR, Monitor Only - Overdue
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (7 DA MIN)
DMR, Monitor Only - Overdue
Whole effluent toxicity - retest #1
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (7 DA MIN)
DMR, Monitor Only - Overdue
Whole Effluent Toxicity, Sub-Lethal Retest #3
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (7 DA MIN)
DMR, Monitor Only - Overdue
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas
0% over limit
Discharged 0 % against a permitted limit of 0 % (7 DA MIN)
DMR, Monitor Only - Overdue
WET, sublethal retest #2
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (7 DA MIN)
DMR, Monitor Only - Overdue
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (7 DA MIN)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
750% over limit
Discharged 0.85 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (7 DA MIN)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
1123% over limit
Discharged 16.65271986 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia
0% over limit
Discharged 0 % against a permitted limit of 0 % (7 DA MIN)
DMR, Monitor Only - Overdue
Whole effluent toxicity - retest #2
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (7 DA MIN)
DMR, Monitor Only - Overdue
February 28, 2026
Phosphorus, total [as P]
940% over limit
Discharged 1.04 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
1007% over limit
Discharged 15.07279987 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Phosphorus, total [as P]
1430% over limit
Discharged 1.53 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
1560% over limit
Discharged 22.61373981 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
2033% over limit
Discharged 3.2 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Phosphorus, total [as P]
1033% over limit
Discharged 1.7 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
830% over limit
Discharged 0.93 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
923% over limit
Discharged 13.93779988 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Phosphorus, total [as P]
270% over limit
Discharged 5.03939996 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
310% over limit
Discharged 0.41 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
427% over limit
Discharged 0.79 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
53% over limit
Discharged 4.6 mg/L against a permitted limit of 3 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
20% over limit
Discharged 2.4 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
3100% over limit
Discharged 4.8 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
1920% over limit
Discharged 2.02 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
30% over limit
Discharged 35.4119997 kg/d against a permitted limit of 27.23999977 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
2051% over limit
Discharged 29.29207975 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
BOD, carbonaceous [5 day, 20 C]
347% over limit
Discharged 67.1 mg/L against a permitted limit of 15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
82% over limit
Discharged 18.2 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
36% over limit
Discharged 184.73259845 kg/d against a permitted limit of 136.29079885 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
3233% over limit
Discharged 5 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
3046% over limit
Discharged 42.85305964 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
3340% over limit
Discharged 3.44 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
30% over limit
Discharged 3.9 mg/L against a permitted limit of 3 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
10233% over limit
Discharged 15.5 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
7974% over limit
Discharged 109.96787908 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
12300% over limit
Discharged 12.4 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Phosphorus, total [as P]
2890% over limit
Discharged 40.71925966 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
2727% over limit
Discharged 4.24 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
2630% over limit
Discharged 2.73 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Phosphorus, total [as P]
653% over limit
Discharged 10.26039991 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
447% over limit
Discharged 0.82 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
510% over limit
Discharged 0.61 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
BOD, carbonaceous [5 day, 20 C]
109% over limit
Discharged 20.9 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
335% over limit
Discharged 65.2 mg/L against a permitted limit of 15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
1240% over limit
Discharged 1.34 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
67% over limit
Discharged 37.6 mg/L against a permitted limit of 22.5 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
1313% over limit
Discharged 2.12 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
199% over limit
Discharged 407.10179658 kg/d against a permitted limit of 136.29079885 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
91% over limit
Discharged 389.71359673 kg/d against a permitted limit of 204.48159828 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
36% over limit
Discharged 20.4 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
1788% over limit
Discharged 25.71455978 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Phosphorus, total [as P]
1080% over limit
Discharged 1.18 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
36% over limit
Discharged 30.6 mg/L against a permitted limit of 22.5 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
1406% over limit
Discharged 20.50717983 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
993% over limit
Discharged 1.64 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
69% over limit
Discharged 345.6755971 kg/d against a permitted limit of 204.48159828 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
9% over limit
Discharged 16.4 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Phosphorus, total [as P]
700% over limit
Discharged 0.8 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
407% over limit
Discharged 0.76 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
6% over limit
Discharged 10.6 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
533% over limit
Discharged 8.61691993 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
10% over limit
Discharged 150.59179873 kg/d against a permitted limit of 136.29079885 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Phosphorus, total [as P]
233% over limit
Discharged 0.5 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
330% over limit
Discharged 5.85205995 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
310% over limit
Discharged 0.41 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Phosphorus, total [as P]
410% over limit
Discharged 0.51 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
420% over limit
Discharged 0.78 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
408% over limit
Discharged 6.91895994 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Phosphorus, total [as P]
367% over limit
Discharged 0.7 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
345% over limit
Discharged 6.06543995 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
350% over limit
Discharged 0.45 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
53% over limit
Discharged 3051 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
November 30, 2024
Coliform, fecal general
20% over limit
Discharged 1199 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
9% over limit
Discharged 147.91319876 kg/d against a permitted limit of 136.29079885 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
87% over limit
Discharged 0.28 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
120% over limit
Discharged 0.22 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
149% over limit
Discharged 3.38683997 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Phosphorus, total [as P]
120% over limit
Discharged 0.22 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
60% over limit
Discharged 0.24 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
119% over limit
Discharged 2.97823997 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Coliform, fecal general
106% over limit
Discharged 412 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
170% over limit
Discharged 0.27 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
132% over limit
Discharged 926 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
197% over limit
Discharged 4.04967997 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
153% over limit
Discharged 0.38 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Phosphorus, total [as P]
116% over limit
Discharged 2.94645998 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
140% over limit
Discharged 0.36 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
110% over limit
Discharged 0.21 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
171% over limit
Discharged 1083 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
July 31, 2024
Phosphorus, total [as P]
82% over limit
Discharged 2.47429998 kg/d against a permitted limit of 1.36199999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
107% over limit
Discharged 0.31 mg/L against a permitted limit of 0.15 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
77% over limit
Discharged 353 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
179% over limit
Discharged 1116 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
80% over limit
Discharged 0.18 mg/L against a permitted limit of 0.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)