Cal Am - Suburban Rosemont
EPA ID: CA3410010 · 54,793 people served · 103 ZIP codes
ZipCheckup's reading of EPA SDWIS for Cal Am - Suburban Rosemont (CA3410010): PFAS sampling above the current EPA limit (UCMR5). With a five-year violation-free history, Cal Am - Suburban Rosemont delivers safe water to 54,793 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Cal Am - Suburban Rosemont Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Cal Am - Suburban Rosemont serves a community with a median household income of $78,230 and an estimated 905,871 residents across its service area. Approximately 69% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 34% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
🌊 Where Does Your Water Come From?
Cal Am - Suburban Rosemont's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
Superfund Proximity Note: This service area ranks in the 70th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 218 detections recorded. 80 exceed federal EPA limits (4 ppt for PFOA/PFOS). 54 exceed state limits.
Comparable Water Systems
Similar-sized systems in California
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Cal Am - Suburban Rosemont (EPA ID: CA3410010) is a community water system in California that serves approximately 54,793 people from surface water sources.
This system provides water to 103 ZIP codes across 2 communities.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: 6 ZIP codes confirmed via EPA Community Water System Service Area Boundaries v3 plus 97 additional ZIPs inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
This system serves 103 ZIP codes:
94203 · 94204 · 94205 · 94206 · 94207 94208 · 94209 · 94211 · 94229 · 94230 94232 · 94234 · 94235 · 94236 · 94237 94239 · 94240 · 94244 · 94245 · 94246 94247 · 94248 · 94249 · 94250 · 94252 94254 · 94256 · 94257 · 94258 · 94259 94261 · 94262 · 94263 · 94267 · 94268 94269 · 94271 · 94273 · 94274 · 94277 94278 · 94279 · 94280 · 94282 · 94283 94284 · 94285 · 94286 · 94287 · 94288 94289 · 94290 · 94291 · 94293 · 94294 94295 · 94296 · 94297 · 94298 · 94299 95670 · 95811 · 95812 · 95813 · 95814 95815 · 95816 · 95817 · 95818 · 95819 95820 · 95821 · 95822 · 95823 · 95824 95825 · 95826 · 95827 · 95828 · 95829 95830 · 95831 · 95832 · 95833 · 95834 95835 · 95836 · 95837 · 95838 · 95840 95841 · 95842 · 95851 · 95852 · 95853 95860 · 95864 · 95865 · 95866 · 95867 95887 · 95894 · 95899
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Cal Am - Suburban Rosemont (CA3410010) on EPA.gov.
Frequently Asked Questions
Is Cal Am - Suburban Rosemont water safe to drink?
Based on EPA records, Cal Am - Suburban Rosemont has no recorded violations in the past 5 years - a positive indicator of water quality management.
How many people does Cal Am - Suburban Rosemont serve?
Cal Am - Suburban Rosemont serves approximately 54,793 people across 103 ZIP codes in California.
Where does Cal Am - Suburban Rosemont get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Above Current MCL
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). One or more PFAS compounds were measured above the current state-enforceable MCL.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Frequently Asked Questions
How to cite this page
ZipCheckup. (2026). Cal Am - Suburban Rosemont, CA: Serves 55K People (2026). https://zipcheckup.com/water-system/ca3410010/
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year = {2026},
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Data as of April 2026.