Rowland Heights, CA Water Safety: 75/100 (2026)
1 ZIP code · 4 water systems · Updated 2026-06-03
Rowland Heights, CA: reliable drinking water, above-average safety record, few violations.
How Rowland Heights Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Rowland Heights Residents
- Homes built before 1986: 74% — older plumbing may contain lead solder.
- Estimated remediation: $2,100 per household.
- CDC health risk index: 10.71.
Rowland Heights's Water Providers
With 3 utilities splitting service in Rowland Heights, CA, water accountability is distributed across 4 systems on the federal record.
Overview
We track water quality and home safety data for 1 ZIP code in Rowland Heights, California (population ~43,137), covering 4 community water systems serving approximately 161,759 people region-wide.
No EPA violations recorded across any ZIP codes in Rowland Heights — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Rowland Heights: B (75/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Rowland Heights water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Rowland Heights
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 91748 | B | Rowland Water District | 54,660 |
All ZIP Codes in Rowland Heights
- 91748 [B]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Rowland Heights Community Health Snapshot
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Rowland Heights Infrastructure Age
With 74% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
The median home in Rowland Heights was built in 1974 — a figure that places most of the city's residential stock in the era when lead solder was still standard in copper plumbing. Homes built before 1986 may have lead-soldered joints; those built before 1970 face the additional possibility of lead pipes in the service line itself.
Over half of homes in Rowland Heights were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
How Remediation Costs Compare in Rowland Heights
While no remediation project is entirely without cost, the relationship between estimated remediation and property values in Rowland Heights is notably favorable — the equity share is small enough that the household financial perspective is one of proportionality rather than pressure, and most homeowners can treat it as routine planning rather than a significant financial event.
Remediation costs in Rowland Heights are relatively low compared to home values. The $1,100–$3,400 estimated range is a small fraction of median property value. Home values are 6% above the California average.
Rowland Heights: Lead Risk & Vulnerable Populations
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
In recent monitoring under the Lead and Copper Rule, citywide samples for Rowland Heights have approached or crossed the regulatory action level on multiple occasions. Combined with 74% of stock dating from the pre-rule era, the picture supports baseline single-tap reads as a standard household-level step.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Rowland Heights: Flood History & Water Damage Risk
100% of ZIP codes in Rowland Heights are mapped into FEMA-designated flood zones, and the NFIP records 5 claims reflecting a multi-event flood history. That combination places local flood exposure in the range where water-quality implications deserve at least periodic attention.
Rowland Heights has a moderate flood history with 5 FEMA claims averaging $4,420 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,100</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Rowland Heights, CA