Plato, Laws 779c

τοὺς δὲ ἀστυνόμους ἐπιμελεῖσθαι καὶ προσαναγκάζοντας τὸν ὀλιγωροῦντα ζημιοῦντας, καὶ πάντων δὴ τῶν κατὰ τὸ ἄστυ καθαρότητός τʼ ἐπιμελεῖσθαι, καὶ ὅπως ἰδιώτης μηδεὶς μηδὲν τῶν τῆς πόλεως μήτε οἰκοδομήμασι μήτε οὖν ὀρύγμασιν ἐπιλήψεται. καὶ δὴ καὶ ὑδάτων τῶν ἐκ Διὸς εὐροίας τούτους ἐπιμελεῖσθαι χρεών, καὶ ὅσα ἐντὸς πόλεως ἢ ὁπόσα ἔξω πρέπον ἂν οἰκεῖν εἴη· ταῦτα δὲ πάντα συνιδόντες ταῖς χρείαις

and the city-stewards should supervise them, and compel by fines those who are negligent, and also watch over the cleanliness of everything in the city, and prevent any private person from encroaching on State property either by buildings or diggings. These officers must also keep a watch over the proper flowing of the rain-water, and over all other matters, whether within or without the city, that it is right for them to manage. All such details—and all else that the lawgiver is unable to deal with and omits—