Hydrohistorian
Boundary Parcel from US EPA Office of Research and Development. About 0 km².
Where the water comes from
| Facility | Kind | Water |
|---|---|---|
| NO 2 WELL | Well | Groundwater |
| WELL NO 1R | Well | Groundwater |
These are EPA's facility records, not DWR structures. Which decreed rights sit behind an intake is the next phase; nothing here is inferred.
DWR structures that name this system
Source Probable join · fetched 2026-09-09 · matched on DWR's recorded contact or an EPA intake name; verify on the dossier
No DWR structure on file records this system as its contact, and none of its EPA intakes matches a structure name in its districts. DWR records a contact on only a fraction of structures, and only for districts fetched from its live service, so this is absence of a record, not evidence of no rights.
Compliance record
Source Register of another agency · fetched 2026-09-09 · verify at EPA ECHO ↗
EPA's summary: violations in 12 of the last 12 quarters; not a serious violator. Contaminants in violation in the last three years, in EPA's words: 2378=1,2,4-Trichlorobenzene; 2380=cis-1,2-Dichloroethylene; 2955=Xylenes, Total; 2964=DICHLOROMETHANE; 2968=o-Dichlorobenzene; 2969=p-Dichlorobenzene; 2976=Vinyl chloride; 2977=1,1-Dichloroethylene; 2979=trans-1,2-Dichloroethylene; 2980=1,2-Dichloroethane; 2981=1,1,1-Trichloroethane; 2982=Carbon tetrachloride; 2983=1,2-Dichloropropane; 2984=Trichloroethylene; 2985=1,1,2-Trichloroethane; 2987=Tetrachloroethylene; 2989=CHLOROBENZENE; 2990=Benzene; 2991=Toluene; 2992=Ethylbenzene; 2996=Styrene; 4010=Combined Radium (-226 and -228); 7000=Consumer Confidence Rule; 7500=Public Notice. Currently in violation for: 7000=Consumer Confidence Rule; 7500=Public Notice.
18 health-based violations on the federal record all time, 3 violations open today. Most recent health-based: Treatment technique not met, compliance period from 2023-04-16, returned to compliance 2023-09-13.
| Period | Kind | Health-based | Status | Measured | Codes |
|---|---|---|---|---|---|
| 2023-04-16 | Treatment technique not met | yes | returned to compliance (2023-09-13) | v45 c0700 r140 | |
| 2022-07-01 – 2022-09-30 | Maximum contaminant level exceeded | yes | returned to compliance (2023-10-04) | 6.3 PCI/L (limit 5.0) | v02 c4010 r340 |
| 2022-05-19 | Other | no | open | v75 c7500 r410 | |
| 2022-04-01 – 2022-06-30 | Maximum contaminant level exceeded | yes | returned to compliance (2023-10-04) | 5.8 PCI/L (limit 5.0) | v02 c4010 r340 |
| 2022-02-11 | Other | no | open | v75 c7500 r410 | |
| 2022-01-01 – 2022-03-31 | Maximum contaminant level exceeded | yes | returned to compliance (2023-10-04) | 6.2 PCI/L (limit 5.0) | v02 c4010 r340 |
| 2021-10-01 – 2021-12-31 | Maximum contaminant level exceeded | yes | returned to compliance (2023-10-04) | 6.3 PCI/L (limit 5.0) | v02 c4010 r340 |
| 2021-10-01 | Treatment technique not met | yes | returned to compliance (2021-10-26) | v12 c0400 r210 | |
| 2021-07-01 – 2021-09-30 | Maximum contaminant level exceeded | yes | returned to compliance (2023-10-04) | 7.39 PCI/L (limit 5.0) | v02 c4010 r340 |
| 2021-04-01 – 2021-06-30 | Maximum contaminant level exceeded | yes | returned to compliance (2023-10-04) | 6.77 PCI/L (limit 5.0) | v02 c4010 r340 |
| 2021-01-01 – 2021-03-31 | Maximum contaminant level exceeded | yes | returned to compliance (2023-10-04) | 6.63 PCI/L (limit 5.0) | v02 c4010 r340 |
| 2020-10-01 – 2020-12-31 | Maximum contaminant level exceeded | yes | returned to compliance (2023-10-04) | 6.63 PCI/L (limit 5.0) | v02 c4010 r340 |
12 of 21 shown; the rest are on the ECHO report.
Lead and copper: the latest 90th-percentile lead result is 0.0005 mg/L (sampling period ending 2025-12-31) against an action level of 0.015 mg/L; 6 results on file.
SDWIS federal reporting carries violations and lead/copper percentiles only; nitrate, disinfection by-product and PFAS sample results are not in it. Codes are EPA's (violation, contaminant, rule); the ECHO report expands them.
PFAS and lithium: EPA's UCMR 5 monitoring, 2023–2025
Source Register of another agency · fetched 2026-09-09 · verify at EPA UCMR occurrence data ↗
EPA did not sample this system under UCMR 5 (the rule covered every system serving more than 3,300 people and a drawn sample of smaller ones).
The record
EPA SDWIS federal reporting as of 2026-09-08; the compliance record above is EPA's own, fetched monthly, and the ECHO report carries the rest. Report a problem →