Stormwater Management: Rancho Cucamonga vs Rialto
How do stormwater management rules compare between Rancho Cucamonga, CA and Rialto, CA?
Rancho Cucamonga and Rialto have similar restriction levels.
Rancho Cucamonga, CA
San Bernardino County
Rancho Cucamonga enforces the San Bernardino County MS4 stormwater permit prohibiting non-stormwater discharges to the storm drain. Construction sites over one acre need a state SWPPP and WDID number.
View full Rancho Cucamonga rules →Rialto, CA
San Bernardino County
Rialto is a co-permittee on the San Bernardino County MS4 NPDES Permit issued by the Santa Ana Regional Water Quality Control Board (Order R8-2010-0036, NPDES No. CAS618036) and enforces stormwater quality controls under Title 13 (Public Services) of the Municipal Code. All non-stormwater discharges to the storm drain (including wash water, paint, oil, and sediment) are prohibited, and construction sites ≥1 acre require coverage under the Statewide Construction General Permit and a SWPPP.
View full Rialto rules →Key Facts Comparison
| Fact | Rancho Cucamonga | Rialto |
|---|---|---|
| MS4 permit | CAS618036 | - |
| SWPPP threshold | 1 acre disturbance | - |
| State system | SMARTS WDID | - |
| Prohibited | Non-stormwater discharges | - |
| Contact | (909) 477-2740 | - |
| MS4 Permit | - | Santa Ana Region Order R8-2010-0036, NPDES CAS618036 |
| Construction permit threshold | - | ≥1 acre disturbed (Construction General Permit) |
| Local code | - | Rialto Municipal Code Title 13 - Public Services |
| Priority concern | - | Perchlorate plume - heightened source control |
| State authority | - | Cal. Water Code §§13260, 13385 |
Highlighted rows indicate differences between cities.
Rancho Cucamonga FAQ
Can I wash my car in my driveway?
Yes, residential car washing is allowed but avoid soap runoff into storm drains; commercial washing requires wastewater capture.
Do small home remodels need a SWPPP?
Projects under one acre don't need a state SWPPP but must still use BMPs like silt fencing and covered stockpiles.
Rialto FAQ
Do I need a permit to wash my driveway in Rialto?
Wash water cannot discharge to the storm drain. Use dry methods (sweeping) or capture and dispose of wash water to the sanitary sewer with permission. Untreated discharge of soap, oil, or sediment to the gutter is an illicit discharge under Title 13.
When do I need a SWPPP for construction?
Any project disturbing 1 acre or more (including smaller sites that are part of a larger common plan) must obtain coverage under the State Construction General Permit and maintain a SWPPP. Smaller sites in Rialto still need erosion and sediment BMPs under the city WQMP.
Can I drain my pool to the street?
Only if dechlorinated and pH-neutral, and only with prior approval. Generally Rialto requires pool water to be discharged to the sanitary sewer via an approved cleanout.
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