Public water system · CA3303026
ActiveGranite Construction Company
At a glance
Granite Construction Company (PWSID CA3303026) is an active non-transient non-community water system in Riverside County, California. It reports serving 40 people through 5 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in April 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
40
Service connections
5
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Granite Construction Company compare with other water systems in Riverside County?
By EPA's size categories, Granite Construction Company is a very small system (500 people or fewer). Riverside County has 197 active public water systems. Its population served is well below the county average of 14,435 people per system, and accounts for less than 0.1% of the 2,843,721 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Granite Construction Company is well below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. California has 1,466 active non-transient non-community water systems, 20% of the state's 7,479 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,179 California systems (83%) list groundwater as their primary source.
Who owns and regulates Granite Construction Company?
EPA lists Granite Construction Company as privately owned. The CA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 130 of the 197 active systems in Riverside County (66%) are also privately owned.
Does Granite Construction Company have drinking water violations?
Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in April 2025. The violations listed here began between April 2013 and April 2025. By type: 8 contaminant level above the legal limit, 3 monitoring and 1 monitoring and reporting. The contaminant or rule involved most often is Combined Uranium (6 of them). EPA lists 10 as resolved and 2 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Archived |
| 2023-03-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Uraniumcode 4006 | No | Archived |
| 2018-07-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2018-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2014-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Fluoridecode 1025 | Yes | Resolved |
| 2014-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2014-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2014-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Fluoridecode 1025 | Yes | Resolved |
| 2013-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Fluoridecode 1025 | Yes | Resolved |
| 2013-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2013-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
| 2013-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Combined Uraniumcode 4006 | Yes | Resolved |
The 12 most recent violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Granite Construction Company: frequently asked questions
Who runs Granite Construction Company?
Granite Construction Company (PWSID CA3303026) is a non-transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Granite Construction Company serve?
Granite Construction Company reports serving 40 people through 5 service connections in Riverside County, California.
Where does Granite Construction Company get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Granite Construction Company have any drinking water violations?
Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in April 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Granite Construction Company's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. Of the 12 most recent violations in EPA's records, 8 are health-based, and the most recent began in April 2025. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Granite Construction Company's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Granite Construction Company is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Riverside County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Eastern Municipal Wd | Riverside | 666,581 | Community | Purchased surface water |
| Riverside, City of | Riverside | 298,398 | Community | Groundwater under influence of surface water |
| Coachella Vwd: Cove Community | Riverside | 270,000 | Community | Groundwater |
| Elsinore Valley Mwd | Riverside | 169,455 | Community | Surface water |
| Corona, City of | Riverside | 168,575 | Community | Purchased surface water |
| Rancho California Water District | Riverside | 146,147 | Community | Purchased surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Granite Construction Company, PWSID CA3303026, California”, https://aquacensus.com/water-systems/california/granite-construction-company-ca3303026 (data as of October 1, 2026).