Source: Laboratory Information Management System

Water Quality & Laboratory

NPDES CA0038539, Order R2-2024-0008 — monitoring at INF-003, EFF-002, EFF-002B and EFF-003 — April 2026

Permit headroom6.95 / 12.50 MGD — 44.4% headroom

NPDES CA0038539

Key insights — Apr 26

Derived from this page’s source data

Compliance

Zero permit exceedances this month

All 180 analyses against Order R2-2024-0008 at INF-003, EFF-002, EFF-002B and EFF-003.

Removal

CBOD 95.7% / TSS 95.8%

Both well above the 85% permit floor; CBOD moved +0.8 pts from Mar 26.

I&I

Inflow and infiltration at 14% of base flow

Wet-weather derived flow is the leading driver of peak-day loading on the plant.

Lab quality

100.0% QC acceptance, 100.0% within hold time

2 regulatory reports due inside the next 31 days.

Permit exceedances

30 of 30 days compliant

CBOD removal

95.7%

85% permit floor

TSS removal

95.8%

85% permit floor

Samples analyzed

180

100.0% within holding time

QC acceptance

100.0%

batch QC passing

CBOD5 — effluent control chart

Monthly Average limit 25 mg/L

Method SM 5210B · amber line marks 90% of the permit limit (internal action level)

TSS — effluent control chart

Monthly Average limit 30 mg/L

Method SM 2540D · amber line marks 90% of the permit limit (internal action level)

Ammonia as N — effluent control chart

Weekly Average limit 4 mg/L

Method EPA 350.1 · amber line marks 90% of the permit limit (internal action level)

Enterococcus — effluent control chart

Daily Maximum limit 104 MPN/100mL

Method SM 9230C · amber line marks 90% of the permit limit (internal action level)

Influent vs. effluent loading and removal efficiency

24 months

Base flow vs. inflow & infiltration

I&I ratio 14.5% of base flow

Sample results register

180 results this period

Sample ID	Collected	Location	Type	Parameter	Result	Permit limit	Limit type	Method	Qualifier	Analyst
S-26-04-0001	04/01/2026	EFF-002	24-hr Composite	CBOD5	6.4 mg/L	25 mg/L	Monthly Average	SM 5210B	—	T. Nguyen
S-26-04-0002	04/02/2026	EFF-002	24-hr Composite	CBOD5	14.9 mg/L	25 mg/L	Monthly Average	SM 5210B	—	M. Delgado
S-26-04-0003	04/03/2026	INF-003	24-hr Composite	CBOD5	16.9 mg/L	25 mg/L	Monthly Average	SM 5210B	—	R. Okafor
S-26-04-0004	04/04/2026	EFF-002B	24-hr Composite	CBOD5	11.5 mg/L	25 mg/L	Monthly Average	SM 5210B	—	K. Baptiste
S-26-04-0005	04/05/2026	EFF-003	24-hr Composite	CBOD5	9.8 mg/L	25 mg/L	Monthly Average	SM 5210B	—	R. Okafor
S-26-04-0006	04/06/2026	INF-003	24-hr Composite	CBOD5	10.7 mg/L	25 mg/L	Monthly Average	SM 5210B	—	R. Okafor
S-26-04-0007	04/07/2026	EFF-002	24-hr Composite	CBOD5	11.8 mg/L	25 mg/L	Monthly Average	SM 5210B	—	T. Nguyen
S-26-04-0008	04/08/2026	EFF-002	24-hr Composite	CBOD5	8.6 mg/L	25 mg/L	Monthly Average	SM 5210B	—	T. Nguyen
S-26-04-0009	04/09/2026	INF-003	24-hr Composite	CBOD5	6.1 mg/L	25 mg/L	Monthly Average	SM 5210B	—	R. Okafor
S-26-04-0010	04/10/2026	EFF-002	24-hr Composite	CBOD5	17 mg/L	25 mg/L	Monthly Average	SM 5210B	—	R. Okafor
S-26-04-0011	04/11/2026	EFF-003	24-hr Composite	CBOD5	10.5 mg/L	25 mg/L	Monthly Average	SM 5210B	—	M. Delgado
S-26-04-0012	04/12/2026	EFF-003	24-hr Composite	CBOD5	13.9 mg/L	25 mg/L	Monthly Average	SM 5210B	—	R. Okafor
S-26-04-0013	04/13/2026	INF-003	24-hr Composite	CBOD5	17.4 mg/L	25 mg/L	Monthly Average	SM 5210B	—	T. Nguyen
S-26-04-0014	04/14/2026	EFF-003	24-hr Composite	CBOD5	11.8 mg/L	25 mg/L	Monthly Average	SM 5210B	—	R. Okafor
S-26-04-0015	04/15/2026	EFF-003	24-hr Composite	CBOD5	17.6 mg/L	25 mg/L	Monthly Average	SM 5210B	—	R. Okafor
S-26-04-0016	04/16/2026	RW-001	24-hr Composite	CBOD5	13.8 mg/L	25 mg/L	Monthly Average	SM 5210B	—	K. Baptiste
S-26-04-0017	04/17/2026	EFF-002B	24-hr Composite	CBOD5	11 mg/L	25 mg/L	Monthly Average	SM 5210B	—	K. Baptiste
S-26-04-0018	04/18/2026	EFF-003	24-hr Composite	CBOD5	5.3 mg/L	25 mg/L	Monthly Average	SM 5210B	—	S. Whitfield

Showing 18 of 180 rows

Instrument calibration & QA/QC

Instrument	Calibration	Next due	Status
Hach DR6000 Spectrophotometer	Current	06/12/2026	Pass
YSI ProDSS Multiparameter	Current	05/28/2026	Pass
Thermo Orion pH Meter	Current	05/09/2026	Pass
IDEXX Quanti-Tray Sealer	Current	07/01/2026	Pass
Mettler Toledo Analytical Balance	Due in 6 days	05/06/2026	Watch
BOD Incubator #2	Current	08/19/2026	Pass

Laboratory operates under ELAP accreditation; the triennial site visit is scheduled for August 2026.

Regulatory reporting calendar

Report	Due	Days remaining	Status
Monthly Self-Monitoring Report (SMR)	05/30/2026	30	In preparation
CIWQS SSO Certification	05/15/2026	15	On track
Pretreatment Annual Report	06/30/2026	61	Not started
Biosolids Annual Report (EPA Form)	02/19/2027	295	Not started
Annual Self-Monitoring Report	03/01/2027	305	Not started

Recycled water production