Public water system · CA4400570
ActiveMountain Summit Mutual Water System
At a glance
Mountain Summit Mutual Water System (PWSID CA4400570) is an active transient non-community water system in Santa Cruz County, California. It reports serving 223 people through 10 service connections. Its primary water source is purchased surface water, and EPA lists it as privately owned. EPA's records list 8 violations for this system; none is health-based, and the most recent began in July 2007.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
223
Service connections
10
Primary source
SWP
Purchased surface water
System type
TNCWS
Transient non-community water system
System record
How does Mountain Summit Mutual Water System compare with other water systems in Santa Cruz County?
By EPA's size categories, Mountain Summit Mutual Water System is a very small system (500 people or fewer). Santa Cruz County has 96 active public water systems. Its population served is well below the county average of 2,856 people per system, and accounts for less than 0.1% of the 274,204 people reported by systems filed under the county. Across California, the 7,479 active systems average 5,706 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Mountain Summit Mutual Water System is about 55% above that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. California has 3,016 active transient non-community water systems, 40% of the state's 7,479 active systems. Purchased surface water means the system buys surface water from another public water system rather than drawing its own. 506 California systems (6.8%) list purchased surface water as their primary source.
Who owns and regulates Mountain Summit Mutual Water System?
EPA lists Mountain Summit Mutual Water System 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. 76 of the 96 active systems in Santa Cruz County (79%) are also privately owned.
Does Mountain Summit Mutual Water System have drinking water violations?
EPA's records list 8 violations for this system; none is health-based, and the most recent began in July 2007. The violations listed here began between December 1982 and July 2007. By type: 4 monitoring and reporting and 4 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 4 as resolved and 4 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 |
|---|---|---|---|---|
| 2007-07-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2005-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1984-08-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1984-06-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1983-10-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
| 1982-12-01 | Public notice, recordkeeping or otherNotification, Public · code 06 | Not reported | No | Archived |
All 8 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.
Mountain Summit Mutual Water System: frequently asked questions
Who runs Mountain Summit Mutual Water System?
Mountain Summit Mutual Water System (PWSID CA4400570) is a transient non-community water system privately owned. It is regulated by the CA state drinking water program.
How many people does Mountain Summit Mutual Water System serve?
Mountain Summit Mutual Water System reports serving 223 people through 10 service connections in Santa Cruz County, California.
Where does Mountain Summit Mutual Water System get its water?
EPA SDWIS lists this system's primary water source as purchased surface water. Purchased surface water means the system buys surface water from another public water system rather than drawing its own.
Does Mountain Summit Mutual Water System have any drinking water violations?
EPA's records list 8 violations for this system; none is health-based, and the most recent began in July 2007. 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 Mountain Summit Mutual Water System'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. EPA's records list 8 violations for this system; none is health-based, and the most recent began in July 2007. For current results, consult EPA ECHO, or the CA state drinking water program.
Where can I find Mountain Summit Mutual Water System's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Mountain Summit Mutual Water System is a 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 Santa Cruz County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Santa Cruz Water Department | Santa Cruz | 94,626 | Community | Surface water |
| Watsonville, City of | Santa Cruz | 65,231 | Community | Surface water |
| Soquel Creek Water District | Santa Cruz | 40,809 | Community | Purchased surface water |
| San Lorenzo Valley Water Dist | Santa Cruz | 21,145 | Community | Surface water |
| Cabrillo College | Santa Cruz | 12,000 | Non-transient non-community | Groundwater |
| Scotts Valley Water District | Santa Cruz | 11,197 | Community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Mountain Summit Mutual Water System, PWSID CA4400570, California”, https://aquacensus.com/water-systems/california/mountain-summit-mutual-water-system-ca4400570 (data as of October 1, 2026).