City of Rio Dell — NPDES permit CA0022748: limits, due date and EPA's record

Sewage treatment plant, Rio Dell, California. NPDES permit CA0022748 expired Oct 31, 2022; its limits still apply. Last 12 months: over a limit 22 times (last June 2026), 28 of 43 reports late. Source: EPA ECHO, Oct 22, 2026.

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

Limits in force (144)

Period ending	Outfall	Parameter	Reported	Limit	Over by
November 2025	003	Coliform, total general, 30-day median	> 1.8 MPN/100mL	≤ 23 MPN/100mL	—
November 2025	003	Coliform, total general, maximum single sample	> 1.8 MPN/100mL	≤ 240 MPN/100mL	—
January 2026	001	Chlorine, total residual, daily maximum	2.046 mg/L	≤ .02 mg/L	10130%
January 2026	001	Chlorine, total residual, daily maximum	5.185 mg/L	≤ .02 mg/L	25825%
January 2026	001	Chlorine, total residual, monthly average	1.69 mg/L	≤ .01 mg/L	16800%
January 2026	001	Chlorine, total residual, monthly average	2.842 mg/L	≤ .01 mg/L	28320%
January 2026	001	Chlorodibromomethane, monthly average	.518 ug/L	≤ .4 ug/L	30%
January 2026	001	Dichlorobromomethane, daily maximum	4.8 ug/L	≤ 1.1 ug/L	336%
January 2026	001	Dichlorobromomethane, monthly average	4.8 ug/L	≤ .56 ug/L	757%
February 2026	001	Chlorine, total residual, daily maximum	1.92 mg/L	≤ .02 mg/L	9500%
February 2026	001	Chlorine, total residual, daily maximum	3.562 mg/L	≤ .02 mg/L	17710%
February 2026	001	Chlorine, total residual, monthly average	1.749 mg/L	≤ .01 mg/L	17390%
February 2026	001	Chlorine, total residual, monthly average	2.691 mg/L	≤ .01 mg/L	26810%
February 2026	001	Dichlorobromomethane, daily maximum	1.12 ug/L	≤ 1.1 ug/L	2%
February 2026	001	Dichlorobromomethane, monthly average	1.12 ug/L	≤ .56 ug/L	100%
March 2026	001	Chlorine, total residual, daily maximum	1.67 mg/L	≤ .02 mg/L	8250%
March 2026	001	Chlorine, total residual, daily maximum	4.839 mg/L	≤ .02 mg/L	24095%
March 2026	001	Chlorine, total residual, monthly average	1.455 mg/L	≤ .01 mg/L	14450%
March 2026	001	Chlorine, total residual, monthly average	2.856 mg/L	≤ .01 mg/L	28460%
March 2026	001	Dichlorobromomethane, daily maximum	1.5 ug/L	≤ 1.1 ug/L	36%
March 2026	001	Dichlorobromomethane, monthly average	1.5 ug/L	≤ .56 ug/L	168%
June 2026	003	Coliform, total general, maximum single sample	350 MPN/100mL	≤ 240 MPN/100mL	46%

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. centigrade	instantaneous maximum	report only (deg C)	all year	001
Temperature, water deg. centigrade	instantaneous maximum	report only (deg C)	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	001
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	001
pH	minimum	≥ 6.5 SU	all year	001
pH	minimum	≥ 6.5 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	monthly average	≤ 30 mg/L	all year	001
Solids, total suspended	weekly average	≤ 45 mg/L	all year	001
Solids, total suspended	weekly average	≤ 45 mg/L	all year	001
Solids, settleable	monthly average	≤ .1 mL/L	all year	001
Solids, settleable	monthly average	≤ .1 mL/L	all year	001
Solids, settleable	daily maximum	≤ .2 mL/L	all year	001
Solids, settleable	daily maximum	≤ .2 mL/L	all year	001
Nitrogen, total [as N]	monthly average	≤ 10 mg/L	all year	001
Nitrogen, total [as N]	monthly average	≤ 10 mg/L	all year	001
Nitrogen, organic total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, organic total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, ammonia, tot unionized [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, ammonia, tot unionized [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, nitrite total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, nitrite total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, nitrate total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, nitrate total [as N]	daily maximum	report only (mg/L)	all year	001
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year	001
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year	001
Aluminum, total recoverable	daily maximum	report only (ug/L)	all year	001
Aluminum, total recoverable	daily maximum	report only (ug/L)	all year	001
Dichlorobromomethane	monthly average	≤ .56 ug/L	all year	001
Dichlorobromomethane	monthly average	≤ .56 ug/L	all year	001
Dichlorobromomethane	monthly average	≤ 13 ug/L	all year	001
Dichlorobromomethane	monthly average	≤ 13 ug/L	all year	001
Dichlorobromomethane	daily maximum	≤ 1.1 ug/L	all year	001
Dichlorobromomethane	daily maximum	≤ 1.1 ug/L	all year	001
Bromoform	daily maximum	report only (ug/L)	all year	001
Bromoform	daily maximum	report only (ug/L)	all year	001
Chloroform	daily maximum	report only (ug/L)	all year	001
Chloroform	daily maximum	report only (ug/L)	all year	001
Chlorodibromomethane	monthly average	≤ .4 ug/L	all year	001
Chlorodibromomethane	monthly average	≤ .4 ug/L	all year	001
Chlorodibromomethane	monthly average	≤ 1.6 ug/L	all year	001
Chlorodibromomethane	monthly average	≤ 1.6 ug/L	all year	001
Chlorodibromomethane	daily maximum	≤ .8 ug/L	all year	001
Chlorodibromomethane	daily maximum	≤ .8 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	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	maximum daily average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	maximum daily average	report only (MGD)	all year	001
Chlorine, total residual	monthly average	≤ .01 mg/L	all year	001
Chlorine, total residual	monthly average	≤ .01 mg/L	all year	001
Chlorine, total residual	monthly average	≤ .01 mg/L	all year	001
Chlorine, total residual	monthly average	≤ .01 mg/L	all year	001
Chlorine, total residual	daily maximum	≤ .02 mg/L	all year	001
Chlorine, total residual	daily maximum	≤ .02 mg/L	all year	001
Chlorine, total residual	daily maximum	≤ .02 mg/L	all year	001
Chlorine, total residual	daily maximum	≤ .02 mg/L	all year	001
Haloacetic acids [HAA5]	monthly average	≤ 60 ug/L	all year	001
Haloacetic acids [HAA5]	monthly average	≤ 60 ug/L	all year	001
Haloacetic acids [HAA5]	monthly average	≤ 150 ug/L	all year	001
Haloacetic acids [HAA5]	monthly average	≤ 150 ug/L	all year	001
Dichloroacetic acid [DCAA]	daily maximum	report only (ug/L)	all year	001
Dichloroacetic acid [DCAA]	daily maximum	report only (ug/L)	all year	001
Monobromoacetic acid [MBAA]	daily maximum	report only (ug/L)	all year	001
Monobromoacetic acid [MBAA]	daily maximum	report only (ug/L)	all year	001
Coliform, total general	monthly median	≤ 23 MPN/100mL	all year	001
Coliform, total general	monthly median	≤ 23 MPN/100mL	all year	001
Coliform, total general	maximum single sample	≤ 240 MPN/100mL	all year	001
Coliform, total general	maximum single sample	≤ 240 MPN/100mL	all year	001
Monochloroacetic acid [MCAA]	daily maximum	report only (ug/L)	all year	001
Monochloroacetic acid [MCAA]	daily maximum	report only (ug/L)	all year	001
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	001
BOD, 5-day, percent removal	monthly average minimum	≥ 85 %	all year	001
Solids, suspended percent removal	monthly average minimum	≥ 85 %	all year	001
Solids, suspended percent removal	monthly average minimum	≥ 85 %	all year	001
Trihalomethane, tot.	monthly average	≤ 80 ug/L	all year	001
Trihalomethane, tot.	monthly average	≤ 80 ug/L	all year	001
Trihalomethane, tot.	monthly average	≤ 110 ug/L	all year	001
Trihalomethane, tot.	monthly average	≤ 110 ug/L	all year	001
Dibromoacetic acid [DBAA]	daily maximum	report only (ug/L)	all year	001
Dibromoacetic acid [DBAA]	daily maximum	report only (ug/L)	all year	001
Trichloroacetic acid [TCAA]	daily maximum	report only (ug/L)	all year	001
Trichloroacetic acid [TCAA]	daily maximum	report only (ug/L)	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	003
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	003
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	003
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year	003
pH	minimum	≥ 6 SU	all year	003
pH	minimum	≥ 6 SU	all year	003
pH	maximum	≤ 9 SU	all year	003
pH	maximum	≤ 9 SU	all year	003
Solids, total suspended	monthly average	≤ 30 mg/L	all year	003
Solids, total suspended	monthly average	≤ 30 mg/L	all year	003
Solids, total suspended	weekly average	≤ 45 mg/L	all year	003
Solids, total suspended	weekly average	≤ 45 mg/L	all year	003
Nitrogen, total [as N]	monthly average	≤ 10 mg/L	Jun, Sep	003
Nitrogen, total [as N]	monthly average	≤ 10 mg/L	Jun, Sep	003
Nitrogen, nitrate total [as N]	daily maximum	report only (mg/L)	Jun, Sep	003
Nitrogen, nitrate total [as N]	daily maximum	report only (mg/L)	Jun, Sep	003
Chloroform	daily maximum	report only (ug/L)	Jun, Sep	003
Chloroform	daily maximum	report only (ug/L)	Jun, Sep	003
Flow, in conduit or thru treatment plant	annual average	≤ .392 MGD	all year	003
Flow, in conduit or thru treatment plant	annual average	≤ .392 MGD	all year	003
Flow, in conduit or thru treatment plant	daily average	≤ 1.5 MGD	all year	003
Flow, in conduit or thru treatment plant	daily average	≤ 1.5 MGD	all year	003
Haloacetic acids [HAA5]	daily maximum	report only (ug/L)	all year	003
Haloacetic acids [HAA5]	daily maximum	report only (ug/L)	all year	003
Dichloroacetic acid [DCAA]	daily maximum	report only (ug/L)	all year	003
Dichloroacetic acid [DCAA]	daily maximum	report only (ug/L)	all year	003
Monobromoacetic acid [MBAA]	daily maximum	report only (ug/L)	all year	003
Monobromoacetic acid [MBAA]	daily maximum	report only (ug/L)	all year	003
Solids, total dissolved	daily maximum	report only (mg/L)	Jun, Sep	003
Solids, total dissolved	daily maximum	report only (mg/L)	Jun, Sep	003
Coliform, total general	30-day median	≤ 23 MPN/100mL	all year	003
Coliform, total general	30-day median	≤ 23 MPN/100mL	all year	003
Coliform, total general	maximum single sample	≤ 240 MPN/100mL	all year	003
Coliform, total general	maximum single sample	≤ 240 MPN/100mL	all year	003
Monochloroacetic acid [MCAA]	daily maximum	report only (ug/L)	all year	003
Monochloroacetic acid [MCAA]	daily maximum	report only (ug/L)	all year	003
Dibromoacetic acid [DBAA]	daily maximum	report only (ug/L)	all year	003
Dibromoacetic acid [DBAA]	daily maximum	report only (ug/L)	all year	003
Trichloroacetic acid [TCAA]	daily maximum	report only (ug/L)	all year	003
Trichloroacetic acid [TCAA]	daily maximum	report only (ug/L)	all year	003
BOD, 5-day, 20 deg. C	daily maximum	report only (mg/L)	all year	INF
BOD, 5-day, 20 deg. C	daily maximum	report only (mg/L)	all year	INF
Solids, total suspended	daily maximum	report only (mg/L)	all year	INF
Solids, total suspended	daily maximum	report only (mg/L)	all year	INF
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	INF
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	INF
Flow, in conduit or thru treatment plant	maximum daily average	report only (MGD)	all year	INF
Flow, in conduit or thru treatment plant	maximum daily average	report only (MGD)	all year	INF
Chlorine, total residual	monthly average	report only (mg/L)	all year	INT
Chlorine, total residual	monthly average	report only (mg/L)	all year	INT
Chlorine, total residual	monthly average	report only (mg/L)	all year	INT
Chlorine, total residual	monthly average	report only (mg/L)	all year	INT
Chlorine, total residual	daily maximum	report only (mg/L)	all year	INT
Chlorine, total residual	daily maximum	report only (mg/L)	all year	INT
Chlorine, total residual	daily maximum	report only (mg/L)	all year	INT
Chlorine, total residual	daily maximum	report only (mg/L)	all year	INT

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/CA0022748 · MCP: https://passage-data.com/mcp